diff --git a/src/libsystemd-network/fuzz-dhcp6-client.c b/src/libsystemd-network/fuzz-dhcp6-client.c
index 02f556709c..204c0e15d2 100644
--- a/src/libsystemd-network/fuzz-dhcp6-client.c
+++ b/src/libsystemd-network/fuzz-dhcp6-client.c
@@ -75,6 +75,9 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
         assert_se(setenv("SYSTEMD_NETWORK_TEST_MODE", "1", 1) >= 0);
 
+        if (!getenv("SYSTEMD_LOG_LEVEL"))
+                log_set_max_level(LOG_CRIT);
+
         if (outside_size_range(size, 0, 65536))
                 return 0;