diff --git a/compiler-rt/lib/asan/tests/asan_test.cpp b/compiler-rt/lib/asan/tests/asan_test.cpp
index 85ed3c6769339..d351e15d1e8a2 100644
--- a/compiler-rt/lib/asan/tests/asan_test.cpp
+++ b/compiler-rt/lib/asan/tests/asan_test.cpp
@@ -395,10 +395,8 @@ TEST(AddressSanitizer, ReallocTest) {
   }
   free(ptr);
   // Realloc pointer returned by malloc(0).
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Walloc-size"
-  int *ptr2 = Ident((int*)malloc(0));
-#pragma clang diagnostic pop
+  volatile void *ptr0 = malloc(0);
+  int *ptr2 = Ident((int *)ptr0);
   ptr2 = Ident((int*)realloc(ptr2, sizeof(*ptr2)));
   *ptr2 = 42;
   EXPECT_EQ(42, *ptr2);