diff --git a/local/recipes/dev/m4/redox.patch b/local/recipes/dev/m4/redox.patch
index 646b442b25..ce7a0e646e 100644
--- a/local/recipes/dev/m4/redox.patch
+++ b/local/recipes/dev/m4/redox.patch
@@ -1,12 +1,16 @@
 --- a/lib/getlocalename_l-unsafe.c
 +++ b/lib/getlocalename_l-unsafe.c
-@@ -658,6 +658,9 @@ getlocalename_l_unsafe (int category, locale_t locale)
+@@ -658,9 +658,10 @@ getlocalename_l_unsafe (int category, locale_t locale)
        };
        const char *name = ((struct __locale_t *) locale)->mb_cur_max == 4 ? "C.UTF-8" : "C";
        return (struct string_with_storage) { name, STORAGE_INDEFINITE };
-+#elif defined __redox__ && HAVE_GETLOCALENAME_L
-+      const char *name = getlocalename_l (category, locale);
-+      return (struct string_with_storage) { name != NULL ? name : "", STORAGE_OBJECT };
+-#elif defined __redox__ && HAVE_GETLOCALENAME_L
+-      const char *name = getlocalename_l (category, locale);
+-      return (struct string_with_storage) { name != NULL ? name : "", STORAGE_OBJECT };
++#elif defined __redox__ && !HAVE_GETLOCALENAME_L
++      /* Redox's relibc has no getlocalename_l; return the closest matching
++         POSIX locale name without referencing a non-existent symbol. */
++      return (struct string_with_storage) { "C", STORAGE_INDEFINITE };
  #else
   #error "Please port gnulib getlocalename_l-unsafe.c to your platform! Report this to bug-gnulib."
  #endif