diff --git a/glide3x/h5/glide3/src/g3df.c b/glide3x/h5/glide3/src/g3df.c
index 9fb4e07..58cd44a 100644
--- a/glide3x/h5/glide3/src/g3df.c
+++ b/glide3x/h5/glide3/src/g3df.c
@@ -101,9 +101,7 @@
 */
 #include <stdio.h>
 #include <string.h>
-#ifdef __GNUC__
 #include <ctype.h>
-#endif
 #include <3dfx.h>
 
 #define FX_DLL_DEFINITION