diff --git a/compiler/testData/codegen/regressions/kt633.kt b/compiler/testData/codegen/regressions/kt633.kt
new file mode 100644
index 00000000000..13a8caceb03
--- /dev/null
+++ b/compiler/testData/codegen/regressions/kt633.kt
@@ -0,0 +1,26 @@
+class mInt(val i : Int) {
+    fun toString() : String = "mint: $i"
+    fun plus(i : Int) = mInt(this.i + i)
+    fun inc() = mInt(i + 1)
+}
+
+class MyArray() {
+    val a = Array<mInt>(10, {mInt(0)})
+    fun get(i : mInt) : mInt = a[i.i]
+    fun set(i : mInt, v : mInt) {
+        a[i.i] = v
+    }
+}
+
+fun box() : String {
+    val a = MyArray()
+    var i = mInt(0)
+      System.out?.println(i)
+    a[i++]// = mInt(1)
+      System.out?.println(i)
+    a[i++] = mInt(1)
+      System.out?.println(i)
+    for (i in 0..9)
+      System.out?.println("ar: ${a[mInt(i)]}")
+    return "OK"
+}
\ No newline at end of file
diff --git a/compiler/tests/org/jetbrains/jet/codegen/ClassGenTest.java b/compiler/tests/org/jetbrains/jet/codegen/ClassGenTest.java
index d81a94199c0..25f6c0d4985 100644
--- a/compiler/tests/org/jetbrains/jet/codegen/ClassGenTest.java
+++ b/compiler/tests/org/jetbrains/jet/codegen/ClassGenTest.java
@@ -293,4 +293,9 @@ public class ClassGenTest extends CodegenTestCase {
     public void testKt725() throws Exception {
         blackBoxFile("regressions/kt725.kt");
     }
+
+    public void testKt633() throws Exception {
+        blackBoxFile("regressions/kt633.kt");
+    }
+
 }