diff --git a/src/fuzz/fuzz-journal-remote.c b/src/fuzz/fuzz-journal-remote.c
index 432c687bc0..3ab4eb07fa 100644
--- a/src/fuzz/fuzz-journal-remote.c
+++ b/src/fuzz/fuzz-journal-remote.c
@@ -29,6 +29,9 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         if (size <= 2)
                 return 0;
 
+        if (!getenv("SYSTEMD_LOG_LEVEL"))
+                log_set_max_level(LOG_CRIT);
+
         assert_se((fdin = memfd_new_and_map("fuzz-journal-remote", size, &mem)) >= 0);
         memcpy(mem, data, size);
         assert_se(munmap(mem, size) == 0);
diff --git a/src/network/fuzz-netdev-parser.c b/src/network/fuzz-netdev-parser.c
index adc85549e5..207d67874f 100644
--- a/src/network/fuzz-netdev-parser.c
+++ b/src/network/fuzz-netdev-parser.c
@@ -11,6 +11,9 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         _cleanup_fclose_ FILE *f = NULL;
         _cleanup_(unlink_tempfilep) char netdev_config[] = "/tmp/fuzz-networkd.XXXXXX";
 
+        if (!getenv("SYSTEMD_LOG_LEVEL"))
+                log_set_max_level(LOG_CRIT);
+
         assert_se(fmkostemp_safe(netdev_config, "r+", &f) == 0);
         if (size != 0)
                 assert_se(fwrite(data, size, 1, f) == 1);
diff --git a/src/network/fuzz-network-parser.c b/src/network/fuzz-network-parser.c
index bfeb46cff3..078b1e6d93 100644
--- a/src/network/fuzz-network-parser.c
+++ b/src/network/fuzz-network-parser.c
@@ -11,6 +11,9 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         _cleanup_fclose_ FILE *f = NULL;
         _cleanup_(unlink_tempfilep) char network_config[] = "/tmp/fuzz-networkd.XXXXXX";
 
+        if (!getenv("SYSTEMD_LOG_LEVEL"))
+                log_set_max_level(LOG_CRIT);
+
         assert_se(fmkostemp_safe(network_config, "r+", &f) == 0);
         if (size != 0)
                 assert_se(fwrite(data, size, 1, f) == 1);