diff --git a/include/wlr/types/wlr_viewporter.h b/include/wlr/types/wlr_viewporter.h
index 0fdd34c8..f909d9cc 100644
--- a/include/wlr/types/wlr_viewporter.h
+++ b/include/wlr/types/wlr_viewporter.h
@@ -32,14 +32,6 @@ struct wlr_viewporter {
 	struct wl_listener display_destroy;
 };
 
-struct wlr_viewport {
-	struct wl_resource *resource;
-	struct wlr_surface *surface;
-
-	struct wl_listener surface_destroy;
-	struct wl_listener surface_commit;
-};
-
 struct wlr_viewporter *wlr_viewporter_create(struct wl_display *display);
 
 #endif
diff --git a/types/wlr_viewporter.c b/types/wlr_viewporter.c
index 34e8d78d..0bfc3333 100644
--- a/types/wlr_viewporter.c
+++ b/types/wlr_viewporter.c
@@ -8,6 +8,14 @@
 
 #define VIEWPORTER_VERSION 1
 
+struct wlr_viewport {
+	struct wl_resource *resource;
+	struct wlr_surface *surface;
+
+	struct wl_listener surface_destroy;
+	struct wl_listener surface_commit;
+};
+
 static const struct wp_viewport_interface viewport_impl;
 
 // Returns NULL if the viewport is inert