--- expr.c
+++ expr.c
@@ -236,8 +236,12 @@
 		if (expr_alloc_and_clone(&nlhs, node->lhs, node->own_lhs) < 0) {
 			if (node->kind == EXPR_OP_CALL2
 			    && node->u.call.own_rhs) {
+/* disable warning, nrhs is set due to previous fall-through */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
 				expr_destroy(nrhs);
 				free(nrhs);
+#pragma GCC diagnostic pop
 				return -1;
 			}
 		}