diff --git a/tests/fuzz/fuzz_cli.cpp b/tests/fuzz/fuzz_cli.cpp
index 2c73e7ab3..42c37c3f1 100644
--- a/tests/fuzz/fuzz_cli.cpp
+++ b/tests/fuzz/fuzz_cli.cpp
@@ -112,7 +112,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
     otCliInit(&node.GetInstance(), CliOutput, nullptr);
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
-    node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true);
+    SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));
     node.GetInstance().Get<Srp::Server>().SetAutoEnableMode(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetDhcp6PdEnabled(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetNat64PrefixManagerEnabled(true);
diff --git a/tests/fuzz/fuzz_icmp6.cpp b/tests/fuzz/fuzz_icmp6.cpp
index faf6c6acc..ec5d8cff4 100644
--- a/tests/fuzz/fuzz_icmp6.cpp
+++ b/tests/fuzz/fuzz_icmp6.cpp
@@ -101,7 +101,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
     node.GetInstance().SetLogLevel(kLogLevelInfo);
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
-    node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true);
+    SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));
     node.GetInstance().Get<Srp::Server>().SetAutoEnableMode(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetDhcp6PdEnabled(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetNat64PrefixManagerEnabled(true);
diff --git a/tests/fuzz/fuzz_ip6.cpp b/tests/fuzz/fuzz_ip6.cpp
index 56eee3705..46c48e0f6 100644
--- a/tests/fuzz/fuzz_ip6.cpp
+++ b/tests/fuzz/fuzz_ip6.cpp
@@ -113,7 +113,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
     node.GetInstance().SetLogLevel(kLogLevelInfo);
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
-    node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true);
+    SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));
     node.GetInstance().Get<Srp::Server>().SetAutoEnableMode(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetDhcp6PdEnabled(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetNat64PrefixManagerEnabled(true);
diff --git a/tests/fuzz/fuzz_mdns.cpp b/tests/fuzz/fuzz_mdns.cpp
index 940983ff4..b4b13bbb4 100644
--- a/tests/fuzz/fuzz_mdns.cpp
+++ b/tests/fuzz/fuzz_mdns.cpp
@@ -112,7 +112,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
     node.GetInstance().SetLogLevel(kLogLevelInfo);
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
-    node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true);
+    SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));
     node.GetInstance().Get<Srp::Server>().SetAutoEnableMode(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetDhcp6PdEnabled(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetNat64PrefixManagerEnabled(true);
diff --git a/tests/fuzz/fuzz_radio-one-node.cpp b/tests/fuzz/fuzz_radio-one-node.cpp
index aa4e229c2..1c799488e 100644
--- a/tests/fuzz/fuzz_radio-one-node.cpp
+++ b/tests/fuzz/fuzz_radio-one-node.cpp
@@ -111,7 +111,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
     node.GetInstance().SetLogLevel(kLogLevelInfo);
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
-    node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true);
+    SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));
     node.GetInstance().Get<Srp::Server>().SetAutoEnableMode(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetDhcp6PdEnabled(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetNat64PrefixManagerEnabled(true);
diff --git a/tests/fuzz/fuzz_trel.cpp b/tests/fuzz/fuzz_trel.cpp
index 997598df3..8bdb63d24 100644
--- a/tests/fuzz/fuzz_trel.cpp
+++ b/tests/fuzz/fuzz_trel.cpp
@@ -102,7 +102,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
     node.GetInstance().SetLogLevel(kLogLevelInfo);
 
     node.GetInstance().Get<BorderRouter::InfraIf>().Init(/* aInfraIfIndex */ 1, /* aInfraIfIsRunning */ true);
-    node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true);
+    SuccessOrQuit(node.GetInstance().Get<BorderRouter::RoutingManager>().SetEnabled(true));
     node.GetInstance().Get<Srp::Server>().SetAutoEnableMode(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetDhcp6PdEnabled(true);
     node.GetInstance().Get<BorderRouter::RoutingManager>().SetNat64PrefixManagerEnabled(true);