diff --git a/tests/stdatomic_test.cpp b/tests/stdatomic_test.cpp
index 222bd9c..b7fb19b 100644
--- a/tests/stdatomic_test.cpp
+++ b/tests/stdatomic_test.cpp
@@ -63,14 +63,17 @@
 
 TEST(stdatomic, atomic_is_lock_free) {
   atomic_char small;
-  atomic_intmax_t big;
   ASSERT_TRUE(atomic_is_lock_free(&small));
+#if defined(__clang__) || __GNUC_PREREQ(4, 7)
+  // Otherwise stdatomic.h doesn't handle this.
+  atomic_intmax_t big;
   // atomic_intmax_t(size = 64) is not lock free on mips32.
 #if defined(__mips__) && !defined(__LP64__)
   ASSERT_FALSE(atomic_is_lock_free(&big));
 #else
   ASSERT_TRUE(atomic_is_lock_free(&big));
 #endif
+#endif
 }
 
 TEST(stdatomic, atomic_flag) {