diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/Inv.java b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/Inv.java
index fd6a663f964..89d757c88ef 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/Inv.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/Inv.java
@@ -11,12 +11,18 @@ import java.util.List;
 
 /**
  * @author yole
+ * @author alex.tkachman
  */
 public class Inv implements IntrinsicMethod {
     @Override
     public StackValue generate(ExpressionCodegen codegen, InstructionAdapter v, Type expectedType, PsiElement element, List<JetExpression> arguments, StackValue receiver) {
         receiver.put(expectedType, v);
-        v.iconst(-1);
+        if(expectedType == Type.LONG_TYPE) {
+            v.lconst(-1L);
+        }
+        else {
+            v.iconst(-1);
+        }
         v.xor(expectedType);
         return StackValue.onStack(expectedType);
     }
diff --git a/compiler/testData/codegen/regressions/kt757.jet b/compiler/testData/codegen/regressions/kt757.jet
new file mode 100644
index 00000000000..8ddfb3d879a
--- /dev/null
+++ b/compiler/testData/codegen/regressions/kt757.jet
@@ -0,0 +1,9 @@
+namespace demo_long
+
+fun Long?.inv() : Long = this.sure().inv()
+
+fun box() : String {
+    val x : Long? = 10
+    System.out?.println(x.inv())
+    return if(x.inv() == -11.lng) "OK" else "fail"
+}
\ No newline at end of file
diff --git a/compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java b/compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java
index b11121da4e6..c5616a811a0 100644
--- a/compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java
+++ b/compiler/tests/org/jetbrains/jet/codegen/PrimitiveTypesTest.java
@@ -350,6 +350,11 @@ public class PrimitiveTypesTest extends CodegenTestCase {
 
     public void testKt684 () {
         blackBoxFile("regressions/kt684.jet");
+//        System.out.println(generateToText());
+    }
+
+    public void testKt757 () {
+        blackBoxFile("regressions/kt757.jet");
 //        System.out.println(generateToText());
     }
 }