diff --git a/include/wlr/types/wlr_single_pixel_buffer_v1.h b/include/wlr/types/wlr_single_pixel_buffer_v1.h
index 747d2a6b..3836203f 100644
--- a/include/wlr/types/wlr_single_pixel_buffer_v1.h
+++ b/include/wlr/types/wlr_single_pixel_buffer_v1.h
@@ -11,7 +11,14 @@
 
 #include <wayland-server-core.h>
 
-struct wlr_single_pixel_buffer_manager_v1;
+struct wlr_single_pixel_buffer_manager_v1 {
+	struct wl_global *global;
+
+	// private state
+
+	struct wl_listener display_destroy;
+};
+
 
 struct wlr_single_pixel_buffer_manager_v1 *wlr_single_pixel_buffer_manager_v1_create(
 	struct wl_display *display);
diff --git a/types/wlr_single_pixel_buffer_v1.c b/types/wlr_single_pixel_buffer_v1.c
index 0ec8f73d..2dab6c53 100644
--- a/types/wlr_single_pixel_buffer_v1.c
+++ b/types/wlr_single_pixel_buffer_v1.c
@@ -8,12 +8,6 @@
 
 #define SINGLE_PIXEL_MANAGER_VERSION 1
 
-struct wlr_single_pixel_buffer_manager_v1 {
-	struct wl_global *global;
-
-	struct wl_listener display_destroy;
-};
-
 struct wlr_single_pixel_buffer_v1 {
 	struct wlr_buffer base;
 	struct wl_resource *resource;