diff --git a/srcpkgs/moc/template b/srcpkgs/moc/template
index ec5904a7c0..3182e187a3 100644
--- a/srcpkgs/moc/template
+++ b/srcpkgs/moc/template
@@ -15,6 +15,10 @@ homepage="http://moc.daper.net"
 distfiles="http://ftp.daper.net/pub/soft/${pkgname}/stable/${pkgname}-${version}.tar.bz2"
 checksum=f3a68115602a4788b7cfa9bbe9397a9d5e24c68cb61a57695d1c2c3ecf49db08
 
+pre_configure() {
+	sed -i -e "s|^ac_cpp='\$CPP |&-P |g" configure
+}
+
 # REMARKS:
 # License used to be marked here as 3-clause-BSD but on bumping ffmpeg I could
 # not find the BSD license to vlicense.