diff --git a/lib/auxlib.h b/lib/auxlib.h
index 7610fac9f..e03439236 100644
--- a/lib/auxlib.h
+++ b/lib/auxlib.h
@@ -448,7 +448,7 @@ INLINE pid_t gettid(void) {
 
 /*** TAINT FUNCTIONS ***/
 
-#if __has_attribute(__error__)
+#if HAS_ATTR(__error__)
 /* This is not supported in clang, and on gcc it might become inert if the
  * symbol gets remapped to a builtin or stack protected function, but it
  * otherwise gives better diagnostics. */
diff --git a/lib/compat.h b/lib/compat.h
index 6bcd61e1a..d39078f32 100644
--- a/lib/compat.h
+++ b/lib/compat.h
@@ -7,12 +7,16 @@
 # define INLINE static inline __attribute__((always_inline))
 #endif
 
-#define ACCESS(...)
 #if defined __has_attribute
-# if __has_attribute(access)
-#  undef ACCESS
-#  define ACCESS(...) __attribute__((access(__VA_ARGS__)))
-# endif
+# define HAS_ATTR(x) __has_attribute(x)
+#else
+# define HAS_ATTR(x) 0
+#endif
+
+#if HAS_ATTR(access)
+# define ACCESS(...) __attribute__((access(__VA_ARGS__)))
+#else
+# define ACCESS(...)
 #endif