diff --git a/gdk/gdksurface.h b/gdk/gdksurface.h
index 434cbfe7e3..2d8c3d0b5f 100644
--- a/gdk/gdksurface.h
+++ b/gdk/gdksurface.h
@@ -37,8 +37,6 @@
 
 G_BEGIN_DECLS
 
-typedef struct _GdkGeometry          GdkGeometry;
-
 /**
  * GdkSurfaceType:
  * @GDK_SURFACE_TOPLEVEL: toplevel window (used to implement #GtkWindow)
diff --git a/gdk/gdktypes.h b/gdk/gdktypes.h
index fed5ab8215..fefb6c62c4 100644
--- a/gdk/gdktypes.h
+++ b/gdk/gdktypes.h
@@ -135,6 +135,8 @@ typedef struct _GdkAppLaunchContext   GdkAppLaunchContext;
 typedef struct _GdkSeat               GdkSeat;
 typedef struct _GdkSnapshot           GdkSnapshot;
 
+typedef struct _GdkGeometry           GdkGeometry;
+
 typedef struct _GdkDrawingContext     GdkDrawingContext;
 typedef struct _GdkDrawContext        GdkDrawContext;
 typedef struct _GdkCairoContext       GdkCairoContext;