diff --git a/tests/fuzz/fuzz-open_channel.c b/tests/fuzz/fuzz-open_channel.c
index bffbedd460f8..999685c65060 100644
--- a/tests/fuzz/fuzz-open_channel.c
+++ b/tests/fuzz/fuzz-open_channel.c
@@ -439,14 +439,14 @@ void init(int *argc, char ***argv)
 
 void run(const u8 *data, size_t size)
 {
-	if (setjmp(fuzz_env) != 0)
-		goto cleanup;
-
 	/* The function under test: fundee_channel(), calls
 	 * clean_tmpctx() mid-run, so create a separate context.
 	 */
 	const tal_t *run_ctx = tal(NULL, tal_t);
 
+	if (setjmp(fuzz_env) != 0)
+		goto cleanup;
+
 	/* Initialize the global pointers to the fuzz data. */
 	cursor = &data;
 	max = &size;