diff --git a/srcpkgs/dev86/template b/srcpkgs/dev86/template
index 137e4f461f8..8ed81d217c7 100644
--- a/srcpkgs/dev86/template
+++ b/srcpkgs/dev86/template
@@ -17,6 +17,10 @@ pre_build() {
 		libc/bios; do
 		sed -i -e "s|\$(CCFLAGS) ||g" ${wrksrc}/${f}/Makefile
 	done
+
+	# Force gnu89 as dev86 mixes k&r style
+	vsed -i -e "s|CFLAGS	=|CFLAGS=-std=gnu89 |g" makefile.in
+	vsed -i -e 's|CFLAGS=|CFLAGS=-std=gnu89 |g' dis88/Makefile
 }
 
 do_install() {