diff --git a/tests/fuzz/fuzz_x509csr.options b/tests/fuzz/fuzz_x509csr.options
new file mode 100644
index 0000000..0824b19
--- /dev/null
+++ b/tests/fuzz/fuzz_x509csr.options
@@ -0,0 +1,2 @@
+[libfuzzer]
+max_len = 65535