diff --git a/test/Sema/builtins.c b/test/Sema/builtins.c
index 357b7b6..e3b3b7e 100644
--- a/test/Sema/builtins.c
+++ b/test/Sema/builtins.c
@@ -40,7 +40,7 @@
 
   old = __sync_fetch_and_add();  // expected-error {{too few arguments to function call}}
   old = __sync_fetch_and_add(&old);  // expected-error {{too few arguments to function call}}
-  old = __sync_fetch_and_add((unsigned*)0, 42i); // expected-warning {{imaginary constants are an extension}}
+  old = __sync_fetch_and_add((unsigned*)0, 42i); // expected-warning {{imaginary constants are a GNU extension}}
 
   // PR7600: Pointers are implicitly casted to integers and back.
   void *old_ptr = __sync_val_compare_and_swap((void**)0, 0, 0);
diff --git a/test/Sema/cast-to-union.c b/test/Sema/cast-to-union.c
index c32964d..7b995e3 100644
--- a/test/Sema/cast-to-union.c
+++ b/test/Sema/cast-to-union.c
@@ -4,16 +4,16 @@
 void f(union u);
 
 void test(int x) {
-  f((union u)x); // expected-warning {{C99 forbids casts to union type}}
+  f((union u)x); // expected-warning {{cast to union type is a GNU extension}}
   f((union u)&x); // expected-error {{cast to union type from type 'int *' not present in union}}
   f((union u)2U); // expected-error {{cast to union type from type 'unsigned int' not present in union}}
 }
 
-union u w = (union u)2; // expected-warning {{C99 forbids casts to union type}}
+union u w = (union u)2; // expected-warning {{cast to union type is a GNU extension}}
 union u ww = (union u)1.0; // expected-error{{cast to union type from type 'double' not present in union}}
 union u x = 7; // expected-error{{initializing 'union u' with an expression of incompatible type 'int'}}
 int i;
-union u zz = (union u)i; // expected-error{{initializer element is not a compile-time constant}}  expected-warning {{C99 forbids casts to union type}}
+union u zz = (union u)i; // expected-error{{initializer element is not a compile-time constant}}  expected-warning {{cast to union type is a GNU extension}}
 
 struct s {int a, b;};
 struct s y = { 1, 5 };
diff --git a/test/Sema/exprs.c b/test/Sema/exprs.c
index a93e12e..df3e258 100644
--- a/test/Sema/exprs.c
+++ b/test/Sema/exprs.c
@@ -40,7 +40,7 @@
 }
 
 _Complex double test2() {
-  return 1.0if;    // expected-warning {{imaginary constants are an extension}}
+  return 1.0if;    // expected-warning {{imaginary constants are a GNU extension}}
 }
 
 // rdar://6097308