diff --git a/include/curl/curl.h b/include/curl/curl.h
index b72d031700..8fed06379c 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -102,11 +102,6 @@
 #include <sys/time.h>
 #endif
 
-/* Compatibility for non-Clang compilers */
-#ifndef __has_declspec_attribute
-#  define __has_declspec_attribute(x) 0
-#endif
-
 #ifdef  __cplusplus
 extern "C" {
 #endif
@@ -121,7 +116,8 @@ typedef void CURLSH;
 #ifdef CURL_STATICLIB
 #  define CURL_EXTERN
 #elif defined(_WIN32) || \
-     (__has_declspec_attribute(dllexport) && \
+     (__has_declspec_attribute && \
+      __has_declspec_attribute(dllexport) && \
       __has_declspec_attribute(dllimport))
 #  if defined(BUILDING_LIBCURL)
 #    define CURL_EXTERN  __declspec(dllexport)