diff --git a/libyasm/bitvect.h b/libyasm/bitvect.h
index 3aee3a5..9b84bf3 100644
--- a/libyasm/bitvect.h
+++ b/libyasm/bitvect.h
@@ -80,11 +80,15 @@ typedef  Z_longword         *Z_longwordptr;
 #ifdef __cplusplus
     typedef bool boolean;
 #else
-    #ifdef MACOS_TRADITIONAL
+     #ifdef MACOS_TRADITIONAL
         #define boolean Boolean
-    #else
-        typedef enum boolean { false = FALSE, true = TRUE } boolean;
-    #endif
+     #else
+        #if __STDC_VERSION__ < 202311L
+            typedef enum boolean { false = FALSE, true = TRUE } boolean;
+        #else
+            typedef bool boolean;
+        #endif
+     #endif
 #endif
 
 /*****************************************************************************/