diff --git a/client.c b/client.c
index 5e9a267..3e01c0c 100644
--- a/client.c
+++ b/client.c
@@ -887,6 +887,7 @@ client_mwm_hints(struct client_ctx *cc)
 		    !(mwmh->decorations & MWM_DECOR_ALL) &&
 		    !(mwmh->decorations & MWM_DECOR_BORDER))
 			cc->bwidth = 0;
+		XFree(mwmh);
 	}
 }