diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/IntrinsicMethods.java b/compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/IntrinsicMethods.java
index 83d4a214ac2..7644fe2c6ae 100644
--- a/compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/IntrinsicMethods.java
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/IntrinsicMethods.java
@@ -79,6 +79,8 @@ public class IntrinsicMethods {
 
         intrinsicsMap.registerIntrinsic(BUILT_INS_PACKAGE_FQ_NAME, null, "arrayOf", 1, new ArrayOf());
 
+        intrinsicsMap.registerIntrinsic(new FqName("kotlin.collections"), new FqNameUnsafe("kotlin.collections.MutableMap"), "set", 2, new MutableMapSet());
+
         ImmutableList<Name> primitiveCastMethods = OperatorConventions.NUMBER_CONVERSIONS.asList();
         for (Name method : primitiveCastMethods) {
             String methodName = method.asString();
diff --git a/compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/MutableMapSet.kt b/compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/MutableMapSet.kt
new file mode 100644
index 00000000000..6a371bcc603
--- /dev/null
+++ b/compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/MutableMapSet.kt
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.codegen.intrinsics
+
+import org.jetbrains.kotlin.codegen.Callable
+import org.jetbrains.kotlin.codegen.CallableMethod
+import org.jetbrains.org.objectweb.asm.Type
+
+/**
+ * This intrinsic mitigates issue KT-14227.
+ *
+ * `MutableMap.get` is an instance method, while `MutableMap.set` is an inline-only extension function from kotlin stdlib.
+ * This confuses very adhoc-ish code written in "old" JVM back-end for augmented assignment and increment/decrement operations desugaring,
+ * which produces incorrect bytecode for such rather trivial constructs.
+ *
+ * Fixing it in general case requires some design decisions for corner cases with arbitrary argument shapes and types for `get` and `set`.
+ */
+class MutableMapSet : IntrinsicMethod() {
+    override fun toCallable(method: CallableMethod): Callable =
+        object : IntrinsicCallable(
+            method,
+            { v ->
+                v.invokeinterface("java/util/Map", "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;")
+                v.pop()
+            }
+        ) {
+            override val parameterTypes: Array<Type>
+                get() = method.valueParameterTypes.toTypedArray()
+        }
+}
\ No newline at end of file
diff --git a/compiler/testData/codegen/box/operatorConventions/kt14227.kt b/compiler/testData/codegen/box/operatorConventions/kt14227.kt
new file mode 100644
index 00000000000..5a26f95ad07
--- /dev/null
+++ b/compiler/testData/codegen/box/operatorConventions/kt14227.kt
@@ -0,0 +1,13 @@
+// IGNORE_BACKEND: JS_IR
+// WITH_RUNTIME
+import kotlin.test.*
+
+fun box(): String {
+    val m = HashMap<String, String>()
+    m["a"] = "A"
+    m["a"] += "B"
+
+    assertEquals("AB", m["a"])
+
+    return "OK"
+}
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
index e0c6026d27a..3ab7fd4ef69 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java
@@ -16394,6 +16394,11 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/operatorConventions/kt14201_2.kt");
         }
 
+        @TestMetadata("kt14227.kt")
+        public void testKt14227() throws Exception {
+            runTest("compiler/testData/codegen/box/operatorConventions/kt14227.kt");
+        }
+
         @TestMetadata("kt20387.kt")
         public void testKt20387() throws Exception {
             runTest("compiler/testData/codegen/box/operatorConventions/kt20387.kt");
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
index 3f7c45f9dbe..eb6e477b4c0 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
@@ -16394,6 +16394,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/operatorConventions/kt14201_2.kt");
         }
 
+        @TestMetadata("kt14227.kt")
+        public void testKt14227() throws Exception {
+            runTest("compiler/testData/codegen/box/operatorConventions/kt14227.kt");
+        }
+
         @TestMetadata("kt20387.kt")
         public void testKt20387() throws Exception {
             runTest("compiler/testData/codegen/box/operatorConventions/kt20387.kt");
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java b/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
index a31d9c97c39..63eb43fcb32 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java
@@ -16399,6 +16399,11 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/operatorConventions/kt14201_2.kt");
         }
 
+        @TestMetadata("kt14227.kt")
+        public void testKt14227() throws Exception {
+            runTest("compiler/testData/codegen/box/operatorConventions/kt14227.kt");
+        }
+
         @TestMetadata("kt20387.kt")
         public void testKt20387() throws Exception {
             runTest("compiler/testData/codegen/box/operatorConventions/kt20387.kt");
diff --git a/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/IrJsCodegenBoxTestGenerated.java b/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/IrJsCodegenBoxTestGenerated.java
index e2434bc7734..6a3a8b7b8cf 100644
--- a/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/IrJsCodegenBoxTestGenerated.java
+++ b/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/IrJsCodegenBoxTestGenerated.java
@@ -13989,6 +13989,11 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/operatorConventions/kt14201_2.kt");
         }
 
+        @TestMetadata("kt14227.kt")
+        public void testKt14227() throws Exception {
+            runTest("compiler/testData/codegen/box/operatorConventions/kt14227.kt");
+        }
+
         @TestMetadata("kt20387.kt")
         public void testKt20387() throws Exception {
             runTest("compiler/testData/codegen/box/operatorConventions/kt20387.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 6ed4f02f0a9..d3e3840b59f 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
@@ -15044,6 +15044,11 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/operatorConventions/kt14201_2.kt");
         }
 
+        @TestMetadata("kt14227.kt")
+        public void testKt14227() throws Exception {
+            runTest("compiler/testData/codegen/box/operatorConventions/kt14227.kt");
+        }
+
         @TestMetadata("kt20387.kt")
         public void testKt20387() throws Exception {
             runTest("compiler/testData/codegen/box/operatorConventions/kt20387.kt");