diff --git a/src/wayland-util.c b/src/wayland-util.c
index d5973bf..47d0bae 100644
--- a/src/wayland-util.c
+++ b/src/wayland-util.c
@@ -147,7 +147,9 @@ wl_array_copy(struct wl_array *array, struct wl_array *source)
 		array->size = source->size;
 	}
 
-	memcpy(array->data, source->data, source->size);
+	if (source->size > 0)
+		memcpy(array->data, source->data, source->size);
+
 	return 0;
 }