diff --git a/include/xwayland/xwm.h b/include/xwayland/xwm.h
index c69504e81..3d5405221 100644
--- a/include/xwayland/xwm.h
+++ b/include/xwayland/xwm.h
@@ -91,8 +91,6 @@ enum atom_name {
 	ATOM_LAST // keep last
 };
 
-extern const char *const atom_map[ATOM_LAST];
-
 struct wlr_xwm {
 	struct wlr_xwayland *xwayland;
 	struct wl_event_source *event_source;
diff --git a/xwayland/xwm.c b/xwayland/xwm.c
index ac615ffe7..4d40f7404 100644
--- a/xwayland/xwm.c
+++ b/xwayland/xwm.c
@@ -19,7 +19,7 @@
 #include <xcb/xfixes.h>
 #include "xwayland/xwm.h"
 
-const char *const atom_map[ATOM_LAST] = {
+static const char *const atom_map[ATOM_LAST] = {
 	[WL_SURFACE_ID] = "WL_SURFACE_ID",
 	[WL_SURFACE_SERIAL] = "WL_SURFACE_SERIAL",
 	[WM_DELETE_WINDOW] = "WM_DELETE_WINDOW",