diff --git a/include/msvcrt/corecrt.h b/include/msvcrt/corecrt.h
index c98b72f7d35..ad46c56591c 100644
--- a/include/msvcrt/corecrt.h
+++ b/include/msvcrt/corecrt.h
@@ -100,6 +100,8 @@
 #   define __cdecl __attribute__((pcs("aapcs-vfp")))
 # elif defined(__aarch64__) && defined (__GNUC__)
 #  define __cdecl __attribute__((ms_abi))
+# else
+#  define __cdecl
 # endif
 #endif /* __cdecl */
 
diff --git a/include/windef.h b/include/windef.h
index 7ece7c8628b..521c3ab4512 100644
--- a/include/windef.h
+++ b/include/windef.h
@@ -93,7 +93,7 @@ extern "C" {
 #   define __cdecl __attribute__((pcs("aapcs-vfp")))
 # elif defined(__aarch64__) && defined (__GNUC__)
 #  define __cdecl __attribute__((ms_abi))
-# elif !defined(_MSC_VER)
+# else
 #  define __cdecl
 # endif
 #endif /* __cdecl */