diff --git a/lib/libc/locale/nomacros.c b/lib/libc/locale/nomacros.c
index ba49a1fe0b3..66cf40e61ec 100644
--- a/lib/libc/locale/nomacros.c
+++ b/lib/libc/locale/nomacros.c
@@ -9,4 +9,10 @@ __FBSDID("$FreeBSD$");
  */
 #define _EXTERNALIZE_CTYPE_INLINES_
 
+/*
+ * Also make sure <runetype.h> does not generate an inline definition
+ * of __getCurrentRuneLocale().
+ */
+#define __RUNETYPE_INTERNAL
+
 #include <ctype.h>