diff --git a/compiler/fir/fir2ir/tests/org/jetbrains/kotlin/codegen/ir/FirBlackBoxCodegenTestGenerated.java b/compiler/fir/fir2ir/tests/org/jetbrains/kotlin/codegen/ir/FirBlackBoxCodegenTestGenerated.java
index fd453cbf249..34de0272d04 100644
--- a/compiler/fir/fir2ir/tests/org/jetbrains/kotlin/codegen/ir/FirBlackBoxCodegenTestGenerated.java
+++ b/compiler/fir/fir2ir/tests/org/jetbrains/kotlin/codegen/ir/FirBlackBoxCodegenTestGenerated.java
@@ -27022,6 +27022,11 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/traits/kt3579_2.kt");
         }
 
+        @TestMetadata("kt36973.kt")
+        public void testKt36973() throws Exception {
+            runTest("compiler/testData/codegen/box/traits/kt36973.kt");
+        }
+
         @TestMetadata("kt5393.kt")
         public void testKt5393() throws Exception {
             runTest("compiler/testData/codegen/box/traits/kt5393.kt");
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/descriptors/JvmDeclarationFactory.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/descriptors/JvmDeclarationFactory.kt
index 76a6984a606..91edea32ee4 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/descriptors/JvmDeclarationFactory.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/descriptors/JvmDeclarationFactory.kt
@@ -233,11 +233,10 @@ class JvmDeclarationFactory(
                 // Old backend doesn't generate ACC_FINAL on DefaultImpls methods.
                 modality = Modality.OPEN,
 
-                // Interface functions are always public, with one exception: clone in Cloneable, which is protected. However, Cloneable
-                // has no DefaultImpls, so this merely replicates the incorrect behavior of the old backend. We should rather not generate
-                // a bridge to clone when interface inherits from Cloneable at all. Below, we force everything, including those bridges,
-                // to be public so that we won't try to generate synthetic accessor for them.
-                visibility = Visibilities.PUBLIC,
+                // Interface functions are public or private, with one exception: clone in Cloneable, which is protected.
+                // However, Cloneable has no DefaultImpls, so this merely replicates the incorrect behavior of the old backend.
+                // We should rather not generate a bridge to clone when interface inherits from Cloneable at all.
+                visibility = if (interfaceFun.visibility == Visibilities.PRIVATE) Visibilities.PRIVATE else Visibilities.PUBLIC,
 
                 typeParametersFromContext = parent.typeParameters
             )
diff --git a/compiler/testData/codegen/box/traits/kt36973.kt b/compiler/testData/codegen/box/traits/kt36973.kt
new file mode 100644
index 00000000000..a954e90ec7d
--- /dev/null
+++ b/compiler/testData/codegen/box/traits/kt36973.kt
@@ -0,0 +1,15 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// FILE: kt36973.kt
+import other.*
+
+class C : IFoo
+
+fun box() = C().foo()()
+
+// FILE: IFoo.kt
+package other
+
+interface IFoo {
+    fun foo() = { bar() }
+    private fun bar() = "OK"
+}
\ No newline at end of file
diff --git a/compiler/testData/codegen/bytecodeListing/privateDefaultImpls.kt b/compiler/testData/codegen/bytecodeListing/privateDefaultImpls.kt
new file mode 100644
index 00000000000..3f9fe99387c
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeListing/privateDefaultImpls.kt
@@ -0,0 +1,4 @@
+interface A {
+    private fun foo() {}
+    private val x get() = 1
+}
\ No newline at end of file
diff --git a/compiler/testData/codegen/bytecodeListing/privateDefaultImpls.txt b/compiler/testData/codegen/bytecodeListing/privateDefaultImpls.txt
new file mode 100644
index 00000000000..1fb7e4dd884
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeListing/privateDefaultImpls.txt
@@ -0,0 +1,11 @@
+@kotlin.Metadata
+public final class A$DefaultImpls {
+    inner class A$DefaultImpls
+    private static method foo(p0: A): void
+    private static method getX(p0: A): int
+}
+
+@kotlin.Metadata
+public interface A {
+    inner class A$DefaultImpls
+}
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
index 590c092b6f8..08c4a845ad8 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
@@ -28538,6 +28538,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/traits/kt3579_2.kt");
         }
 
+        @TestMetadata("kt36973.kt")
+        public void testKt36973() throws Exception {
+            runTest("compiler/testData/codegen/box/traits/kt36973.kt");
+        }
+
         @TestMetadata("kt5393.kt")
         public void testKt5393() throws Exception {
             runTest("compiler/testData/codegen/box/traits/kt5393.kt");
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java
index e234b18fd14..43e000337a7 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java
@@ -104,6 +104,11 @@ public class BytecodeListingTestGenerated extends AbstractBytecodeListingTest {
         runTest("compiler/testData/codegen/bytecodeListing/platformTypes.kt");
     }
 
+    @TestMetadata("privateDefaultImpls.kt")
+    public void testPrivateDefaultImpls() throws Exception {
+        runTest("compiler/testData/codegen/bytecodeListing/privateDefaultImpls.kt");
+    }
+
     @TestMetadata("privateDefaultSetter.kt")
     public void testPrivateDefaultSetter() throws Exception {
         runTest("compiler/testData/codegen/bytecodeListing/privateDefaultSetter.kt");
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
index 7a1cedd5738..dab112bea72 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
@@ -27355,6 +27355,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/traits/kt3579_2.kt");
         }
 
+        @TestMetadata("kt36973.kt")
+        public void testKt36973() throws Exception {
+            runTest("compiler/testData/codegen/box/traits/kt36973.kt");
+        }
+
         @TestMetadata("kt5393.kt")
         public void testKt5393() throws Exception {
             runTest("compiler/testData/codegen/box/traits/kt5393.kt");
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
index d8d8f31da17..4fca346ad33 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
@@ -27022,6 +27022,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/traits/kt3579_2.kt");
         }
 
+        @TestMetadata("kt36973.kt")
+        public void testKt36973() throws Exception {
+            runTest("compiler/testData/codegen/box/traits/kt36973.kt");
+        }
+
         @TestMetadata("kt5393.kt")
         public void testKt5393() throws Exception {
             runTest("compiler/testData/codegen/box/traits/kt5393.kt");
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java
index 72ecc9a7eef..0ade53844bb 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java
@@ -104,6 +104,11 @@ public class IrBytecodeListingTestGenerated extends AbstractIrBytecodeListingTes
         runTest("compiler/testData/codegen/bytecodeListing/platformTypes.kt");
     }
 
+    @TestMetadata("privateDefaultImpls.kt")
+    public void testPrivateDefaultImpls() throws Exception {
+        runTest("compiler/testData/codegen/bytecodeListing/privateDefaultImpls.kt");
+    }
+
     @TestMetadata("privateDefaultSetter.kt")
     public void testPrivateDefaultSetter() throws Exception {
         runTest("compiler/testData/codegen/bytecodeListing/privateDefaultSetter.kt");
diff --git a/js/js.tests/test/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java b/js/js.tests/test/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
index c8aa19f7702..20d494af17e 100644
--- a/js/js.tests/test/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
+++ b/js/js.tests/test/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
@@ -21923,6 +21923,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/traits/kt3579_2.kt");
         }
 
+        @TestMetadata("kt36973.kt")
+        public void testKt36973() throws Exception {
+            runTest("compiler/testData/codegen/box/traits/kt36973.kt");
+        }
+
         @TestMetadata("kt5393.kt")
         public void testKt5393() throws Exception {
             runTest("compiler/testData/codegen/box/traits/kt5393.kt");
diff --git a/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java b/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
index dc8f06a32ae..033946a68d1 100644
--- a/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
+++ b/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
@@ -21983,6 +21983,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/traits/kt3579_2.kt");
         }
 
+        @TestMetadata("kt36973.kt")
+        public void testKt36973() throws Exception {
+            runTest("compiler/testData/codegen/box/traits/kt36973.kt");
+        }
+
         @TestMetadata("kt5393.kt")
         public void testKt5393() throws Exception {
             runTest("compiler/testData/codegen/box/traits/kt5393.kt");