diff --git a/usr.bin/mklocale/ldef.h b/usr.bin/mklocale/ldef.h
index f35506b3483..70ce43a43a0 100644
--- a/usr.bin/mklocale/ldef.h
+++ b/usr.bin/mklocale/ldef.h
@@ -38,6 +38,7 @@
  */
 
 #include <sys/types.h>
+#include "runefile.h"
 
 /*
  * This should look a LOT like a _RuneEntry