diff --git a/srcpkgs/libgltf/template b/srcpkgs/libgltf/template
index fbb79e5ee1f..c82d21edd7f 100644
--- a/srcpkgs/libgltf/template
+++ b/srcpkgs/libgltf/template
@@ -11,6 +11,7 @@ license="MPL"
 homepage="http://www.libreoffice.org"
 distfiles="http://dev-www.libreoffice.org/src/${pkgname}/${pkgname}-${version}.tar.gz"
 checksum=119e730fbf002dd0eaafa4930167267d7d910aa17f29979ca9ca8b66625fd2da
+CXXFLAGS="-DGLM_ENABLE_EXPERIMENTAL"
 
 libgltf-devel_package() {
 	depends="libgltf>=${version}_${revision} $makedepends"