diff --git a/test/CodeGen/cast-to-union.c b/test/CodeGen/cast-to-union.c
index 67429929..1f7e045 100644
--- a/test/CodeGen/cast-to-union.c
+++ b/test/CodeGen/cast-to-union.c
@@ -1,5 +1,5 @@
 // RUN: clang-cc -emit-llvm  %s -o - | FileCheck %s
-// CHECK: w = global %0 { i32 2, [4 x i8] zeroinitializer }
+// CHECK: w = global %0 { i32 2, [4 x i8] undef }
 // CHECK: y = global %union.u { double 7.300000e+0{{[0]*}}1 }
 // CHECK: store i32 351, i32
 
diff --git a/test/CodeGen/union-init2.c b/test/CodeGen/union-init2.c
index 184d75f..e782425 100644
--- a/test/CodeGen/union-init2.c
+++ b/test/CodeGen/union-init2.c
@@ -1,4 +1,4 @@
-// RUN: clang-cc -emit-llvm %s -o - -triple i686-pc-linux-gnu | grep "bitcast (%0\* @r to %union.x\*), \[4 x i8\] zeroinitializer"
+// RUN: clang-cc -emit-llvm %s -o - -triple i686-pc-linux-gnu | grep "bitcast (%0\* @r to %union.x\*), \[4 x i8\] undef"
 
 // Make sure we generate something sane instead of a ptrtoint
 union x {long long b;union x* a;} r = {.a = &r};