diff --git a/srcpkgs/zerofree/template b/srcpkgs/zerofree/template
index 055505cc23..2e8df3eb3f 100644
--- a/srcpkgs/zerofree/template
+++ b/srcpkgs/zerofree/template
@@ -11,6 +11,10 @@ homepage="https://frippery.org/uml/index.html"
 distfiles="https://frippery.org/uml/${pkgname}-${version}.tgz"
 checksum=a7f9e293961eb653df55cf54774f2036924f31019814ead5554c393eecae6838
 
+post_extract() {
+	sed -i "16i#include <sys/stat.h>" zerofree.c
+}
+
 do_install() {
 	vbin $pkgname
 }