diff --git a/usr.bin/m4/lib/ohash.h b/usr.bin/m4/lib/ohash.h
index 698f02e4a1d1..03de431d726b 100644
--- a/usr.bin/m4/lib/ohash.h
+++ b/usr.bin/m4/lib/ohash.h
@@ -58,8 +58,7 @@ void ohash_delete(struct ohash *);
 unsigned int ohash_lookup_interval(struct ohash *, const char *,
 	    const char *, uint32_t);
 unsigned int ohash_lookup_memory(struct ohash *, const char *,
-	    size_t, uint32_t)
-		__attribute__ ((__bounded__(__string__,2,3)));
+	    size_t, uint32_t);
 void *ohash_find(struct ohash *, unsigned int);
 void *ohash_remove(struct ohash *, unsigned int);
 void *ohash_insert(struct ohash *, unsigned int, void *);