diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/FunctionTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/FunctionTest.java
index c829649bbc4..a6fee9c6a5c 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/FunctionTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/FunctionTest.java
@@ -131,4 +131,8 @@ public class FunctionTest extends AbstractExpressionTest {
     public void testManglingAnyMethods() throws Exception {
         checkFooBoxIsOk();
     }
+
+    public void testLocalExtFunction() throws Exception {
+        checkFooBoxIsOk();
+    }
 }
diff --git a/js/js.translator/testData/expression/function/cases/localExtFunction.kt b/js/js.translator/testData/expression/function/cases/localExtFunction.kt
new file mode 100644
index 00000000000..9aeb8f33a5f
--- /dev/null
+++ b/js/js.translator/testData/expression/function/cases/localExtFunction.kt
@@ -0,0 +1,9 @@
+package foo
+
+fun box(): String {
+    fun String.test(i: Int) = this + i + "OK"
+    val a = "foo".test(32)
+    if (a != "foo32OK") return "$a"
+
+    return "OK"
+}
\ No newline at end of file