diff --git a/configure.ac b/configure.ac
index 848c92f8fe..a3442caf7b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -236,9 +236,9 @@ dnl GTK is optional and used in examples
 HAVE_GTK=no
 GTK_REQ=3.0.0
 if test "x$BUILD_EXAMPLES" = "xyes"; then
-  PKG_CHECK_MODULES(GTK, gtk+-$with_gtk >= $GTK_REQ, HAVE_GTK=yes, HAVE_GTK=no)
+  PKG_CHECK_MODULES(GTK, gtk+-3.0 >= $GTK_REQ, HAVE_GTK=yes, HAVE_GTK=no)
   dnl some examples need gtk+-x11
-  PKG_CHECK_MODULES(GTK_X11, gtk+-x11-$with_gtk >= $GTK_REQ, HAVE_GTK_X11=yes, HAVE_GTK_X11=no)
+  PKG_CHECK_MODULES(GTK_X11, gtk+-x11-3.0 >= $GTK_REQ, HAVE_GTK_X11=yes, HAVE_GTK_X11=no)
   AC_SUBST(GTK_LIBS)
   AC_SUBST(GTK_CFLAGS)
 fi