diff --git a/gdk/gdkversionmacros.h.in b/gdk/gdkversionmacros.h.in
index 443c286b93..647acb21a3 100644
--- a/gdk/gdkversionmacros.h.in
+++ b/gdk/gdkversionmacros.h.in
@@ -80,6 +80,16 @@
  */
 #define GDK_VERSION_3_4         (G_ENCODE_VERSION (3, 4))
 
+/**
+ * GDK_VERSION_3_6:
+ *
+ * A macro that evaluates to the 3.6 version of GDK, in a format
+ * that can be used by the C pre-processor.
+ *
+ * Since: 3.6
+ */
+#define GDK_VERSION_3_6         (G_ENCODE_VERSION (3, 6))
+
 
 /* evaluates to the current stable version; for development cycles,
  * this means the next stable target