diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index e97887099630..18ecf1719f2c 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -1938,10 +1938,8 @@ LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
   if (!hasAggregateLLVMType(E->getType())) {
     // Emit the LHS as an l-value.
     LValue LV = EmitLValue(E->getLHS());
-    
-    llvm::Value *RHS = EmitScalarExpr(E->getRHS());
-    EmitStoreOfScalar(RHS, LV.getAddress(), LV.isVolatileQualified(), 
-                      E->getType());
+    // Sore the value through the l-value.
+    EmitStoreThroughLValue(EmitAnyExpr(E->getRHS()), LV, E->getType());
     return LV;
   }
   
diff --git a/clang/test/CodeGenCXX/expr.cpp b/clang/test/CodeGenCXX/expr.cpp
index 26bda055b3d7..775169d9578b 100644
--- a/clang/test/CodeGenCXX/expr.cpp
+++ b/clang/test/CodeGenCXX/expr.cpp
@@ -18,3 +18,13 @@ void test2() { ++a+=10; }
 // PR7892
 int test3(const char*);
 int test3g = test3(__PRETTY_FUNCTION__);
+
+
+// PR7889
+struct test4A {
+  int j : 2;
+};
+int test4() {
+  test4A a;
+  (a.j = 2) = 3;
+}