diff --git a/recipes-security/libmhash/libmhash_0.9.9.9.bb b/recipes-security/libmhash/libmhash_0.9.9.9.bb
index f5518d2..805cf05 100644
--- a/recipes-security/libmhash/libmhash_0.9.9.9.bb
+++ b/recipes-security/libmhash/libmhash_0.9.9.9.bb
@@ -25,6 +25,8 @@ SRC_URI[sha256sum] = "56521c52a9033779154432d0ae47ad7198914785265e1f570cee21ab24
 
 inherit autotools-brokensep ptest multilib_header
 
+CFLAGS += "-std=gnu17"
+
 do_install:append() {
     oe_multilib_header mutils/mhash_config.h
 }