diff --git a/fdbrpc/FailureMonitor.actor.cpp b/fdbrpc/FailureMonitor.actor.cpp
index ceb709a6c7..36600a44f6 100644
--- a/fdbrpc/FailureMonitor.actor.cpp
+++ b/fdbrpc/FailureMonitor.actor.cpp
@@ -156,7 +156,7 @@ Future<Void> SimpleFailureMonitor::onStateChanged(Endpoint const& endpoint) {
 		return endpointKnownFailed.onChange(endpoint);
 }
 
-FailureStatus SimpleFailureMonitor::getState(Endpoint const& endpoint) {
+FailureStatus SimpleFailureMonitor::getState(Endpoint const& endpoint) const {
 	if (failedEndpoints.count(endpoint))
 		return FailureStatus(true);
 	else {
@@ -170,7 +170,7 @@ FailureStatus SimpleFailureMonitor::getState(Endpoint const& endpoint) {
 	}
 }
 
-FailureStatus SimpleFailureMonitor::getState(NetworkAddress const& address) {
+FailureStatus SimpleFailureMonitor::getState(NetworkAddress const& address) const {
 	auto a = addressStatus.find(address);
 	if (a == addressStatus.end())
 		return FailureStatus();
@@ -178,7 +178,7 @@ FailureStatus SimpleFailureMonitor::getState(NetworkAddress const& address) {
 		return a->second;
 }
 
-bool SimpleFailureMonitor::onlyEndpointFailed(Endpoint const& endpoint) {
+bool SimpleFailureMonitor::onlyEndpointFailed(Endpoint const& endpoint) const {
 	if (!failedEndpoints.count(endpoint)) return false;
 	auto a = addressStatus.find(endpoint.getPrimaryAddress());
 	if (a == addressStatus.end())
@@ -187,7 +187,7 @@ bool SimpleFailureMonitor::onlyEndpointFailed(Endpoint const& endpoint) {
 		return !a->second.failed;
 }
 
-bool SimpleFailureMonitor::permanentlyFailed(Endpoint const& endpoint) {
+bool SimpleFailureMonitor::permanentlyFailed(Endpoint const& endpoint) const {
 	return failedEndpoints.count(endpoint);
 }
 
diff --git a/fdbrpc/FailureMonitor.h b/fdbrpc/FailureMonitor.h
index 434f0f9a91..f31b7a2d84 100644
--- a/fdbrpc/FailureMonitor.h
+++ b/fdbrpc/FailureMonitor.h
@@ -87,10 +87,10 @@ struct FailureStatus {
 class IFailureMonitor {
 public:
 	// Returns the currently known status for the endpoint
-	virtual FailureStatus getState(Endpoint const& endpoint) = 0;
+	virtual FailureStatus getState(Endpoint const& endpoint) const = 0;
 
 	// Returns the currently known status for the address
-	virtual FailureStatus getState(NetworkAddress const& address) = 0;
+	virtual FailureStatus getState(NetworkAddress const& address) const = 0;
 
 	// Only use this function when the endpoint is known to be failed
 	virtual void endpointNotFound(Endpoint const&) = 0;
@@ -102,10 +102,10 @@ public:
 	virtual Future<Void> onDisconnectOrFailure(Endpoint const& endpoint) = 0;
 
 	// Returns true if the endpoint is failed but the address of the endpoint is not failed.
-	virtual bool onlyEndpointFailed(Endpoint const& endpoint) = 0;
+	virtual bool onlyEndpointFailed(Endpoint const& endpoint) const = 0;
 
 	// Returns true if the endpoint will never become available.
-	virtual bool permanentlyFailed(Endpoint const& endpoint) = 0;
+	virtual bool permanentlyFailed(Endpoint const& endpoint) const = 0;
 
 	// Called by FlowTransport when a connection closes and a prior request or reply might be lost
 	virtual void notifyDisconnect(NetworkAddress const&) = 0;
@@ -140,14 +140,14 @@ public:
 	SimpleFailureMonitor();
 	void setStatus(NetworkAddress const& address, FailureStatus const& status);
 	void endpointNotFound(Endpoint const&);
-	virtual void notifyDisconnect(NetworkAddress const&);
+	void notifyDisconnect(NetworkAddress const&) override;
 
-	virtual Future<Void> onStateChanged(Endpoint const& endpoint);
-	virtual FailureStatus getState(Endpoint const& endpoint);
-	virtual FailureStatus getState(NetworkAddress const& address);
-	virtual Future<Void> onDisconnectOrFailure(Endpoint const& endpoint);
-	virtual bool onlyEndpointFailed(Endpoint const& endpoint);
-	virtual bool permanentlyFailed(Endpoint const& endpoint);
+	Future<Void> onStateChanged(Endpoint const& endpoint) override;
+	FailureStatus getState(Endpoint const& endpoint) const override;
+	FailureStatus getState(NetworkAddress const& address) const override;
+	Future<Void> onDisconnectOrFailure(Endpoint const& endpoint) override;
+	bool onlyEndpointFailed(Endpoint const& endpoint) const override;
+	bool permanentlyFailed(Endpoint const& endpoint) const override;
 
 	void reset();