diff --git a/srcpkgs/gtkmm/template b/srcpkgs/gtkmm/template
index c4b646985ae..2bd7ff79150 100644
--- a/srcpkgs/gtkmm/template
+++ b/srcpkgs/gtkmm/template
@@ -13,6 +13,8 @@ license="LGPL-2.1"
 distfiles="${GNOME_SITE}/gtkmm/${version%.*}/gtkmm-$version.tar.xz"
 checksum=91afd98a31519536f5f397c2d79696e3d53143b80b75778521ca7b48cb280090
 
+CXXFLAGS="-D_GLIBCXX_USE_C99_STDLIB=1"
+
 pre_configure() {
 	NOCONFIGURE=1 ./autogen.sh
 }