diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/ExtensionFunctionTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/ExtensionFunctionTest.java
index 36ccebbc444..90007e9cf87 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/ExtensionFunctionTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/ExtensionFunctionTest.java
@@ -62,4 +62,8 @@ public final class ExtensionFunctionTest extends SingleFileTranslationTest {
     public void testGenericExtension() throws Exception {
         checkFooBoxIsOk("generic.kt");
     }
+
+    public void testExtensionFunctionCalledFromExtensionFunction() throws Exception {
+        checkFooBoxIsTrue("extensionFunctionCalledFromExtensionFunction.kt");
+    }
 }
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java
index 745dacc163d..08e9b3be226 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java
@@ -57,4 +57,8 @@ public final class NativeInteropTest extends SingleFileTranslationTest {
     public void testUndefined() throws Exception {
         checkFooBoxIsTrue("undefined.kt");
     }
+
+    public void testKt1519() throws Exception {
+        checkFooBoxIsTrue("KT-1519.kt");
+    }
 }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/reference/CallTranslator.java b/js/js.translator/src/org/jetbrains/k2js/translate/reference/CallTranslator.java
index 6ccfa6b0890..de99c283273 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/reference/CallTranslator.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/reference/CallTranslator.java
@@ -44,6 +44,7 @@ import static org.jetbrains.k2js.translate.utils.TranslationUtils.getThisObject;
  * @author Pavel Talanov
  */
 //TODO: write tests on calling backing fields as functions
+//TODO: refactor call parameters to be used across the class
 public final class CallTranslator extends AbstractTranslator {
 
     private static class CallParameters {
@@ -95,15 +96,15 @@ public final class CallTranslator extends AbstractTranslator {
 
     @NotNull
         /*package*/ JsExpression translate() {
-        //NOTE: treat native extension function calls as usual calls
         if (isIntrinsic()) {
             return intrinsicInvocation();
         }
         if (isConstructor()) {
             return constructorCall();
         }
-        if (isNative()) {
-            return methodCall();
+        //NOTE: treat native extension function calls as usual calls
+        if (isNativeExtensionFunctionCall()) {
+            return nativeExtensionCall();
         }
         if (isExtensionFunctionLiteral()) {
             return extensionFunctionLiteralCall();
@@ -114,6 +115,12 @@ public final class CallTranslator extends AbstractTranslator {
         return methodCall();
     }
 
+    @NotNull
+    private JsExpression nativeExtensionCall() {
+        receiver = getExtensionFunctionCallReceiver();
+        return methodCall();
+    }
+
     private boolean isIntrinsic() {
         return context().intrinsics().isIntrinsic(descriptor);
     }
@@ -144,8 +151,8 @@ public final class CallTranslator extends AbstractTranslator {
         return ReferenceTranslator.translateAsFQReference(descriptor, context());
     }
 
-    private boolean isNative() {
-        return AnnotationsUtils.isNativeObject(descriptor);
+    private boolean isNativeExtensionFunctionCall() {
+        return AnnotationsUtils.isNativeObject(descriptor) && isExtensionFunction();
     }
 
     private boolean isExtensionFunctionLiteral() {
@@ -251,6 +258,7 @@ public final class CallTranslator extends AbstractTranslator {
 
     @NotNull
     private CallParameters callParameters() {
+        // TODO: this check corresponds to expression as function, make it clearer
         if (callee != null) {
             return new CallParameters(null, callee);
         }
diff --git a/js/js.translator/testFiles/extensionFunction/cases/extensionFunctionCalledFromExtensionFunction.kt b/js/js.translator/testFiles/extensionFunction/cases/extensionFunctionCalledFromExtensionFunction.kt
new file mode 100644
index 00000000000..028df1d7d1c
--- /dev/null
+++ b/js/js.translator/testFiles/extensionFunction/cases/extensionFunctionCalledFromExtensionFunction.kt
@@ -0,0 +1,12 @@
+package foo
+
+class A() {
+
+}
+
+fun A.one() = 1
+fun A.two() = one() + one()
+
+fun box() : Boolean {
+    return (A().two() == 2)
+}
\ No newline at end of file
diff --git a/js/js.translator/testFiles/native/cases/KT-1519.kt b/js/js.translator/testFiles/native/cases/KT-1519.kt
new file mode 100644
index 00000000000..212e021eb4d
--- /dev/null
+++ b/js/js.translator/testFiles/native/cases/KT-1519.kt
@@ -0,0 +1,19 @@
+package foo
+
+native
+class Wow() {
+    val x : Int = js.noImpl
+    val y : Int = js.noImpl
+}
+
+native
+fun Wow.sum() : Int = js.noImpl
+
+fun Wow.dblSum() : Int {
+    return 2 * sum()
+}
+
+
+fun box() : Boolean {
+    return (Wow().dblSum() == 6)
+}
\ No newline at end of file
diff --git a/js/js.translator/testFiles/native/native/KT-1519.js b/js/js.translator/testFiles/native/native/KT-1519.js
new file mode 100644
index 00000000000..cf3b5a1e60a
--- /dev/null
+++ b/js/js.translator/testFiles/native/native/KT-1519.js
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2000-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+function Wow() {
+    this.x = 1;
+    this.y = 2;
+}
+
+Wow.prototype.sum = function() {
+    return this.x + this.y;
+};
\ No newline at end of file