diff --git a/tools/m4/Makefile b/tools/m4/Makefile
index c13155397d2..eaa46ec4f87 100644
--- a/tools/m4/Makefile
+++ b/tools/m4/Makefile
@@ -8,17 +8,16 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=m4
 PKG_CPE_ID:=cpe:/a:gnu:m4
-PKG_VERSION:=1.4.19
+PKG_VERSION:=1.4.20
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
-PKG_HASH:=3be4a26d825ffdfda52a56fc43246456989a3630093cced3fbddf4771ee58a70
+PKG_HASH:=6ac4fc31ce440debe63987c2ebbf9d7b6634e67a7c3279257dc7361de8bdb3ef
 
 HOST_BUILD_PARALLEL:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 
-HOST_CFLAGS += -std=gnu17
 HOST_CONFIGURE_VARS += gl_cv_func_strstr_linear=no
 
 define Host/Uninstall