diff --git a/char32.c b/char32.c
index 71d2ae5..0ca029a 100644
--- a/char32.c
+++ b/char32.c
@@ -5,7 +5,12 @@
 #include <assert.h>
 
 #include <wchar.h>
-#include <stdc-predef.h>
+
+#if defined __has_include
+ #if __has_include (<stdc-predef.h>)
+   #include <stdc-predef.h>
+ #endif
+#endif
 
 #define LOG_MODULE "char32"
 #define LOG_ENABLE_DBG 0