diff --git a/carapace-server/src/main/java/org/carapaceproxy/core/HttpProxyServer.java b/carapace-server/src/main/java/org/carapaceproxy/core/HttpProxyServer.java
index 5e6fadde9..e76130534 100644
--- a/carapace-server/src/main/java/org/carapaceproxy/core/HttpProxyServer.java
+++ b/carapace-server/src/main/java/org/carapaceproxy/core/HttpProxyServer.java
@@ -287,6 +287,11 @@ public int getLocalPort() {
         return listeners.getLocalPort();
     }
 
+    @VisibleForTesting
+    public void setMapper(final EndpointMapper mapper) {
+        this.mapper = mapper;
+    }
+
     public void startAdminInterface() throws Exception {
         if (!adminServerEnabled) {
             return;
diff --git a/carapace-server/src/test/java/org/carapaceproxy/backends/StuckRequestsTest.java b/carapace-server/src/test/java/org/carapaceproxy/backends/StuckRequestsTest.java
index 21121e8b8..b9680c18f 100644
--- a/carapace-server/src/test/java/org/carapaceproxy/backends/StuckRequestsTest.java
+++ b/carapace-server/src/test/java/org/carapaceproxy/backends/StuckRequestsTest.java
@@ -44,9 +44,9 @@
 import org.carapaceproxy.server.config.NetworkListenerConfiguration;
 import org.carapaceproxy.server.config.RouteConfiguration;
 import org.carapaceproxy.server.config.SafeBackendSelector;
-import org.carapaceproxy.server.mapper.EndpointMapper;
 import org.carapaceproxy.server.mapper.StandardEndpointMapper;
 import org.carapaceproxy.server.mapper.requestmatcher.RegexpRequestMatcher;
+import org.carapaceproxy.utils.EndpointMapperHolder;
 import org.carapaceproxy.utils.RawHttpClient;
 import org.junit.Rule;
 import org.junit.Test;
@@ -85,14 +85,14 @@ public void testBackendUnreachableOnStuckRequest(boolean backendsUnreachableOnSt
         final int theport = wireMockRule.port();
         EndpointKey key = new EndpointKey("localhost", theport);
 
-        final EndpointMapper.Factory mapperFactory = parent -> {
+        final EndpointMapperHolder mapperFactory = new EndpointMapperHolder(parent -> {
             StandardEndpointMapper mapper = new StandardEndpointMapper(parent, SafeBackendSelector::new);
             mapper.addBackend(new BackendConfiguration("backend-a", "localhost", theport, "/", -1));
             mapper.addDirector(new DirectorConfiguration("director-1").addBackend("backend-a"));
             mapper.addAction(new ActionConfiguration("proxy-1", ActionConfiguration.TYPE_PROXY, "director-1", null, -1));
             mapper.addRoute(new RouteConfiguration("route-1", "proxy-1", true, new RegexpRequestMatcher(PROPERTY_URI, ".*index.html.*")));
             return mapper;
-        };
+        });
         try (HttpProxyServer server = new HttpProxyServer(mapperFactory, tmpDir.newFolder());) {
             Properties properties = new Properties();
             properties.put("connectionsmanager.stuckrequesttimeout", "100"); // ms
@@ -100,6 +100,7 @@ public void testBackendUnreachableOnStuckRequest(boolean backendsUnreachableOnSt
             // configure resets all listeners configurations
             server.configureAtBoot(new PropertiesConfigurationStore(properties));
             server.addListener(new NetworkListenerConfiguration("localhost", 0));
+            server.setMapper(mapperFactory.getEndpointMapper());
             assertEquals(100, server.getCurrentConfiguration().getStuckRequestTimeout());
             assertEquals(backendsUnreachableOnStuckRequests, server.getCurrentConfiguration().isBackendsUnreachableOnStuckRequests());
             server.start();
diff --git a/carapace-server/src/test/java/org/carapaceproxy/backends/UnreachableBackendTest.java b/carapace-server/src/test/java/org/carapaceproxy/backends/UnreachableBackendTest.java
index 9ed576dd3..574ea016f 100644
--- a/carapace-server/src/test/java/org/carapaceproxy/backends/UnreachableBackendTest.java
+++ b/carapace-server/src/test/java/org/carapaceproxy/backends/UnreachableBackendTest.java
@@ -69,7 +69,6 @@ public UnreachableBackendTest(boolean useCache) {
 
     @Test
     public void testWithUnreachableBackend() throws Exception {
-
         stubFor(get(urlEqualTo("/index.html"))
                 .willReturn(aResponse()
                         .withStatus(200)
@@ -114,11 +113,12 @@ public void testEmptyResponse() throws Exception {
         TestEndpointMapper mapper = new TestEndpointMapper("localhost", dummyport, useCache);
         EndpointKey key = new EndpointKey("localhost", dummyport);
 
-        try (HttpProxyServer server = new HttpProxyServer(mapper, tmpDir.newFolder())) {
+        try (HttpProxyServer server = new HttpProxyServer(mapper, tmpDir.newFolder());) {
             Properties properties = new Properties();
             // configure resets all listeners configurations
             server.configureAtBoot(new PropertiesConfigurationStore(properties));
             server.addListener(new NetworkListenerConfiguration("localhost", 0));
+            server.setMapper(mapper);
             server.start();
             int port = server.getLocalPort();
             assertTrue(port > 0);
@@ -182,10 +182,11 @@ public void testNonHttpResponseThenClose() throws Exception {
         TestEndpointMapper mapper = new TestEndpointMapper("localhost", dummyport, useCache);
         EndpointKey key = new EndpointKey("localhost", dummyport);
 
-        try (HttpProxyServer server = new HttpProxyServer(mapper, tmpDir.newFolder())) {
+        try (HttpProxyServer server = new HttpProxyServer(mapper, tmpDir.newFolder());) {
             Properties properties = new Properties();
             server.configureAtBoot(new PropertiesConfigurationStore(properties));
             server.addListener(new NetworkListenerConfiguration("localhost", 0));
+            server.setMapper(mapper);
             server.start();
             int port = server.getLocalPort();
 
diff --git a/carapace-server/src/test/java/org/carapaceproxy/utils/EndpointMapperHolder.java b/carapace-server/src/test/java/org/carapaceproxy/utils/EndpointMapperHolder.java
new file mode 100644
index 000000000..2ceaffe16
--- /dev/null
+++ b/carapace-server/src/test/java/org/carapaceproxy/utils/EndpointMapperHolder.java
@@ -0,0 +1,26 @@
+package org.carapaceproxy.utils;
+
+import org.carapaceproxy.core.HttpProxyServer;
+import org.carapaceproxy.server.config.ConfigurationNotValidException;
+import org.carapaceproxy.server.mapper.EndpointMapper;
+
+public class EndpointMapperHolder implements EndpointMapper.Factory {
+    private final EndpointMapper.Factory factory;
+    private EndpointMapper endpointMapper;
+    public EndpointMapperHolder(final EndpointMapper.Factory factory) {
+        this.factory = factory;
+    }
+
+    public EndpointMapper getEndpointMapper() {
+        return endpointMapper;
+    }
+
+    @Override
+    public EndpointMapper build(final HttpProxyServer httpProxyServer) throws ConfigurationNotValidException {
+        if (endpointMapper == null) {
+            endpointMapper = factory.build(httpProxyServer);
+        }
+
+        return endpointMapper;
+    }
+}