diff --git a/include/dlib.h b/include/dlib.h
index 7db27be..508f62d 100644
--- a/include/dlib.h
+++ b/include/dlib.h
@@ -1,7 +1,9 @@
 #ifndef __DLIB_H
 #define __DLIB_H 1
 
-typedef enum { false, true } bool;
+#if __STDC_VERSION__ < 202311L
+  typedef enum { false, true } bool;
+#endif
 enum { ERROR, SUCCESS, DLIB_MAXBUF = 1024 };
 
 #define DLIB_VERSION "0.1b"