diff --git a/client/X11/xf_rail.c b/client/X11/xf_rail.c
index 4928175d5..d4fec546b 100644
--- a/client/X11/xf_rail.c
+++ b/client/X11/xf_rail.c
@@ -226,6 +226,7 @@ void xf_rail_invalidate_region(xfContext* xfc, REGION16* invalidRegion)
 		}
 	}
 
+	free(pKeys);
 	region16_uninit(&windowInvalidRegion);
 }