diff --git a/src/bitcoin.c b/src/bitcoin.c
index e16a9f1c..7f9b5f23 100644
--- a/src/bitcoin.c
+++ b/src/bitcoin.c
@@ -405,7 +405,7 @@ retry:
 		}
 		goto out;
 	}
-	if (!json_is_true(res_val)) {
+	if (!json_is_null(res_val)) {
 		res_ret = json_string_value(res_val);
 		if (res_ret && strlen(res_ret)) {
 			LOGWARNING("SUBMIT BLOCK RETURNED: %s", res_ret);