diff --git a/configure.in b/configure.in
index 0bd54f837e..32d6143e05 100644
--- a/configure.in
+++ b/configure.in
@@ -11,13 +11,13 @@ AC_PREREQ(2.54)
 # set GTK_BINARY_AGE and GTK_INTERFACE_AGE to 0.
 
 m4_define([gtk_major_version], [2])
-m4_define([gtk_minor_version], [12])
-m4_define([gtk_micro_version], [2])
-m4_define([gtk_version],
-          [gtk_major_version.gtk_minor_version.gtk_micro_version])
-m4_define([gtk_interface_age], [2])
+m4_define([gtk_minor_version], [15])
+m4_define([gtk_micro_version], [0])
+m4_define([gtk_interface_age], [0])
 m4_define([gtk_binary_age],
           [m4_eval(100 * gtk_minor_version + gtk_micro_version)])
+m4_define([gtk_version],
+          [gtk_major_version.gtk_minor_version.gtk_micro_version])
 # This is the X.Y used in -lgtk-FOO-X.Y
 m4_define([gtk_api_version], [2.0])