diff --git a/sway/focus.c b/sway/focus.c
index b94dcbc71..35dff1e4c 100644
--- a/sway/focus.c
+++ b/sway/focus.c
@@ -114,7 +114,7 @@ bool set_focused_container(swayc_t *c) {
 		c = get_focused_container(workspace);
 	}
 
-	swayc_log(L_DEBUG, c, "Setting focus to %p:%lu" PRIuPTR, c, c->handle);
+	swayc_log(L_DEBUG, c, "Setting focus to %p:%" PRIuPTR, c, c->handle);
 
 	if (c->type == C_VIEW) {
 		// dispatch a window event