diff --git a/idea/src/org/jetbrains/jet/lang/cfg/JetControlFlowProcessor.java b/idea/src/org/jetbrains/jet/lang/cfg/JetControlFlowProcessor.java
index c06344a5f17..fffc992da55 100644
--- a/idea/src/org/jetbrains/jet/lang/cfg/JetControlFlowProcessor.java
+++ b/idea/src/org/jetbrains/jet/lang/cfg/JetControlFlowProcessor.java
@@ -186,26 +186,24 @@ public class JetControlFlowProcessor {
                 }
                 else if (left instanceof JetArrayAccessExpression) {
                     JetArrayAccessExpression arrayAccessExpression = (JetArrayAccessExpression) left;
-                    for (JetExpression index : arrayAccessExpression.getIndexExpressions()) {
-                        value(index, false, false);
-                    }
-                    value(arrayAccessExpression.getArrayExpression(), false, false);
-                    value(expression.getOperationReference(), false, false);
-                    builder.write(expression, left); // TODO : ???
+                    visitAssignToArrayAccess(expression, arrayAccessExpression);
                 } else {
                     builder.unsupported(expression); // TODO
                 }
             }
             else if (JetTypeInferrer.assignmentOperationNames.containsKey(operationType)) {
-                JetExpression left = expression.getLeft();
-                value(left, false, false);
+                JetExpression left = JetPsiUtil.deparenthesize(expression.getLeft());
+                if (left != null) {
+                    value(left, false, false);
+                }
                 if (right != null) {
                     value(right, false, false);
                 }
-                if (left instanceof JetSimpleNameExpression) {
+                if (left instanceof JetSimpleNameExpression || left instanceof JetArrayAccessExpression) {
+                    value(expression.getOperationReference(), false, false);
                     builder.write(expression, left);
                 }
-                else {
+                else if (left != null) {
                     builder.unsupported(expression); // TODO
                 }
             }
@@ -219,6 +217,15 @@ public class JetControlFlowProcessor {
             }
         }
 
+        private void visitAssignToArrayAccess(JetBinaryExpression expression, JetArrayAccessExpression arrayAccessExpression) {
+            for (JetExpression index : arrayAccessExpression.getIndexExpressions()) {
+                value(index, false, false);
+            }
+            value(arrayAccessExpression.getArrayExpression(), false, false);
+            value(expression.getOperationReference(), false, false);
+            builder.write(expression, arrayAccessExpression); // TODO : ???
+        }
+
         @Override
         public void visitUnaryExpression(JetUnaryExpression expression) {
             JetSimpleNameExpression operationSign = expression.getOperationSign();
diff --git a/idea/testData/cfg/ArrayAccess.instructions b/idea/testData/cfg/ArrayAccess.instructions
index 1a2e454f773..02b6aaa8d4e 100644
--- a/idea/testData/cfg/ArrayAccess.instructions
+++ b/idea/testData/cfg/ArrayAccess.instructions
@@ -5,6 +5,8 @@ fun foo() {
   a[10] = 4
   2
   a[10]
+  100
+  a[10] += 1
 }
 ---------------------
 l0:
@@ -21,6 +23,13 @@ l0:
     r(10)
     r(a)
     r(a[10])
+    r(100)
+    r(10)
+    r(a)
+    r(a[10])
+    r(1)
+    r(+=)
+    w(a[10])
 l1:
     <END>
 error:
diff --git a/idea/testData/cfg/ArrayAccess.jet b/idea/testData/cfg/ArrayAccess.jet
index 5b65ec3f10c..07bacf3c9cd 100644
--- a/idea/testData/cfg/ArrayAccess.jet
+++ b/idea/testData/cfg/ArrayAccess.jet
@@ -4,4 +4,6 @@ fun foo() {
   a[10] = 4
   2
   a[10]
+  100
+  a[10] += 1
 }
diff --git a/idea/testData/cfg/Assignments.instructions b/idea/testData/cfg/Assignments.instructions
index b487e0ca4d8..b3689759034 100644
--- a/idea/testData/cfg/Assignments.instructions
+++ b/idea/testData/cfg/Assignments.instructions
@@ -18,6 +18,7 @@ l0:
     w(x)
     r(x)
     r(2)
+    r(+=)
     w(x)
     r(true)
     jf(l2)