diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/ExportedDefaultParameterStub.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/ExportedDefaultParameterStub.kt
index 05f73e148b2..6b806fc98c5 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/ExportedDefaultParameterStub.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/ExportedDefaultParameterStub.kt
@@ -41,7 +41,7 @@ class ExportedDefaultParameterStub(val context: JsIrBackendContext) : Declaratio
             irIfThenElse(
                 toParameter.type,
                 irEqeqeq(
-                    irGet(toParameter),
+                    irGet(toParameter, context.irBuiltIns.anyNType),
                     irCall(this@ExportedDefaultParameterStub.context.intrinsics.jsUndefined)
                 ),
                 defaultValue.expression,
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt
index 9aaa04fec29..54d3fa46e3e 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/ExpressionHelpers.kt
@@ -128,6 +128,8 @@ fun IrBuilderWithScope.irGet(type: IrType, variable: IrValueSymbol) =
 
 fun IrBuilderWithScope.irGet(variable: IrValueDeclaration) = irGet(variable.type, variable.symbol)
 
+fun IrBuilderWithScope.irGet(variable: IrValueDeclaration, type: IrType) = irGet(type, variable.symbol)
+
 fun IrBuilderWithScope.irSet(variable: IrValueSymbol, value: IrExpression, origin: IrStatementOrigin = IrStatementOrigin.EQ) =
     IrSetValueImpl(startOffset, endOffset, context.irBuiltIns.unitType, variable, value, origin)
 
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrBoxJsES6TestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrBoxJsES6TestGenerated.java
index 0a857d33796..23620275cfd 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrBoxJsES6TestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrBoxJsES6TestGenerated.java
@@ -2110,6 +2110,11 @@ public class IrBoxJsES6TestGenerated extends AbstractIrBoxJsES6Test {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
         }
 
+        @TestMetadata("defaultInlineClassConstructorParam.kt")
+        public void testDefaultInlineClassConstructorParam() throws Exception {
+            runTest("js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt");
+        }
+
         @TestMetadata("exportAllFile.kt")
         public void testExportAllFile() throws Exception {
             runTest("js/js.translator/testData/box/export/exportAllFile.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java
index fc3201d06d2..5fe6b97128d 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java
@@ -2105,6 +2105,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
         }
 
+        @TestMetadata("defaultInlineClassConstructorParam.kt")
+        public void testDefaultInlineClassConstructorParam() throws Exception {
+            runTest("js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt");
+        }
+
         @TestMetadata("exportAllFile.kt")
         public void testExportAllFile() throws Exception {
             runTest("js/js.translator/testData/box/export/exportAllFile.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java
index a8f77ac27ee..91348071ba6 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java
@@ -1780,6 +1780,11 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
             KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
         }
 
+        @TestMetadata("defaultInlineClassConstructorParam.kt")
+        public void testDefaultInlineClassConstructorParam() throws Exception {
+            runTest("js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt");
+        }
+
         @TestMetadata("exportAllFile.kt")
         public void testExportAllFile() throws Exception {
             runTest("js/js.translator/testData/box/export/exportAllFile.kt");
diff --git a/js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt b/js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt
new file mode 100644
index 00000000000..eba7dfed5ff
--- /dev/null
+++ b/js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt
@@ -0,0 +1,16 @@
+// KT-49225
+// RUN_PLAIN_BOX_FUNCTION
+// IGNORE_BACKEND: JS
+
+// MODULE: lib
+// FILE: lib.kt
+value class Koo(val koo: String = "OK")
+
+@JsExport
+class Bar(val koo: Koo = Koo())
+
+// MODULE: main(lib)
+// FILE: main.js
+function box() {
+    return new main.Bar().koo;
+}
\ No newline at end of file