diff --git a/src/lib9/utf/utfecpy.c b/src/lib9/utf/utfecpy.c
index 5715935..fde9338 100644
--- a/src/lib9/utf/utfecpy.c
+++ b/src/lib9/utf/utfecpy.c
@@ -13,8 +13,8 @@
  */
 #include <stdarg.h>
 #include <string.h>
+#include "plan9.h"
 #include "utf.h"
-#include "utfdef.h"
 
 char*
 utfecpy(char *to, char *e, char *from)