diff --git a/src/raylib.h b/src/raylib.h
index 0b1a6b19..6d597fef 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -296,9 +296,8 @@
 //----------------------------------------------------------------------------------
 #ifndef __cplusplus
 // Boolean type
-    #if !defined(_STDBOOL_H)
+    #if !defined(_STDBOOL_H) || !defined(__STDBOOL_H)   // CLang uses second form
         typedef enum { false, true } bool;
-        #define _STDBOOL_H
     #endif
 #endif