diff --git a/cmd/wmii/utf.c b/cmd/wmii/utf.c
index 89caca5a..439e5b78 100644
--- a/cmd/wmii/utf.c
+++ b/cmd/wmii/utf.c
@@ -1,4 +1,5 @@
 /* Public Domain --Kris Maglione */
+#include <errno.h>
 #include <iconv.h>
 #include <string.h>
 #include <util.h>