diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
index d1e51de62105..39d6a575aa2c 100644
--- a/clang/lib/Sema/SemaInit.cpp
+++ b/clang/lib/Sema/SemaInit.cpp
@@ -1555,10 +1555,11 @@ void InitListChecker::CheckStructUnionTypes(const InitializedEntity &Entity,
       }
     }
 
-    // Value-initialize the first named member of the union.
+    // Value-initialize the first member of the union that isn't an unnamed
+    // bitfield.
     for (RecordDecl::field_iterator FieldEnd = RD->field_end();
          Field != FieldEnd; ++Field) {
-      if (Field->getDeclName()) {
+      if (!Field->isUnnamedBitfield()) {
         if (VerifyOnly)
           CheckEmptyInitializable(
               InitializedEntity::InitializeMember(*Field, &Entity),
diff --git a/clang/test/CodeGenCXX/cxx1y-initializer-aggregate.cpp b/clang/test/CodeGenCXX/cxx1y-initializer-aggregate.cpp
index 8bdf8633d61e..098a4b945e04 100644
--- a/clang/test/CodeGenCXX/cxx1y-initializer-aggregate.cpp
+++ b/clang/test/CodeGenCXX/cxx1y-initializer-aggregate.cpp
@@ -36,6 +36,17 @@ B y {};
 B z { 1 };
 // CHECK: @z = global {{.*}} { i32 1 }
 
+// Brace initialization should initialize the first field even though it is
+// unnamed.
+union C {
+  struct {
+    int C::*memptr;
+  };
+};
+
+C n{};
+// CHECK: @n = global %union.C { %struct.anon { i64 -1 } }, align 8
+
 // Initialization of 'a':
 
 // CHECK: store i32 0, i32* getelementptr inbounds ({{.*}} @a, i32 0, i32 0)