diff --git a/rc/Makefile.am b/rc/Makefile.am
index 6587d3c..23a4fc3 100644
--- a/rc/Makefile.am
+++ b/rc/Makefile.am
@@ -1,2 +1,2 @@
-styleconfdir=$(prefix)/share/themes/tdegtk/gtk-3.0
+styleconfdir=$(GTK3_PREFIX)/share/themes/tdegtk/gtk-3.0
 styleconf_DATA = gtk.css