diff --git a/include/wctype.h b/include/wctype.h
index 330b5ed0dc2c..098045fa11a5 100644
--- a/include/wctype.h
+++ b/include/wctype.h
@@ -34,7 +34,7 @@
 #include <sys/cdefs.h>
 #include <sys/_types.h>
 
-#include <ctype.h>
+#include <_ctype.h>
 
 #ifndef _WCTRANS_T
 typedef	int	wctrans_t;