diff --git a/src/fuzz/fuzz-dhcp6-client.c b/src/fuzz/fuzz-dhcp6-client.c
index c9bc2b38155..6d887eaf1f8 100644
--- a/src/fuzz/fuzz-dhcp6-client.c
+++ b/src/fuzz/fuzz-dhcp6-client.c
@@ -49,6 +49,9 @@ static void fuzz_client(const uint8_t *data, size_t size, bool is_information_re
 }
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+        if (size > 65536)
+                return 0;
+
         /* This triggers client_receive_advertise */
         fuzz_client(data, size, false);
 
diff --git a/src/fuzz/fuzz-dhcp6-client.options b/src/fuzz/fuzz-dhcp6-client.options
new file mode 100644
index 00000000000..678d526b1ea
--- /dev/null
+++ b/src/fuzz/fuzz-dhcp6-client.options
@@ -0,0 +1,2 @@
+[libfuzzer]
+max_len = 65536