diff --git a/pom.xml b/pom.xml
index 69318dfcc..3cc3edcea 100644
--- a/pom.xml
+++ b/pom.xml
@@ -154,7 +154,7 @@
         <dependency>
             <groupId>com.github.tomakehurst</groupId>
             <artifactId>wiremock-standalone</artifactId>
-            <version>2.4.1</version>
+            <version>2.16.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>
diff --git a/src/main/java/org/jenkinsci/plugins/github_branch_source/GitHubOrgWebHook.java b/src/main/java/org/jenkinsci/plugins/github_branch_source/GitHubOrgWebHook.java
index f32e0f375..7427ef8aa 100644
--- a/src/main/java/org/jenkinsci/plugins/github_branch_source/GitHubOrgWebHook.java
+++ b/src/main/java/org/jenkinsci/plugins/github_branch_source/GitHubOrgWebHook.java
@@ -48,20 +48,11 @@ public class GitHubOrgWebHook {
     private static final Logger LOGGER = Logger.getLogger(GitHubOrgWebHook.class.getName());
     private static final List<GHEvent> EVENTS = Arrays.asList(GHEvent.REPOSITORY, GHEvent.PUSH, GHEvent.PULL_REQUEST, GHEvent.PULL_REQUEST_REVIEW_COMMENT);
 
-    /**
-     * Verify if exists a webhook by its URL.
-     */
-    private static boolean existsHook(GHOrganization org, String url) throws IOException {
-        for (GHHook hook : org.getHooks()) {
-            if (hook.getConfig().get("url").equals(url)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
     public static void register(GitHub hub, String orgName) throws IOException {
-        String rootUrl = Jenkins.getActiveInstance().getRootUrl();
+        String rootUrl = System.getProperty("jenkins.hook.url");
+        if (rootUrl == null) {
+            rootUrl = Jenkins.get().getRootUrl();
+        }
         if (rootUrl == null) {
             return;
         }
diff --git a/src/test/java/org/jenkinsci/plugins/github_branch_source/GitHubOrgWebHookTest.java b/src/test/java/org/jenkinsci/plugins/github_branch_source/GitHubOrgWebHookTest.java
new file mode 100644
index 000000000..33e478009
--- /dev/null
+++ b/src/test/java/org/jenkinsci/plugins/github_branch_source/GitHubOrgWebHookTest.java
@@ -0,0 +1,56 @@
+/*
+ * The MIT License
+ *
+ * Copyright 2019 CloudBees, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package org.jenkinsci.plugins.github_branch_source;
+
+import static com.github.tomakehurst.wiremock.client.WireMock.*;
+import static com.github.tomakehurst.wiremock.core.WireMockConfiguration.wireMockConfig;
+import com.github.tomakehurst.wiremock.junit.WireMockRule;
+import org.junit.Rule;
+import org.junit.Test;
+import org.jvnet.hudson.test.Issue;
+import org.jvnet.hudson.test.JenkinsRule;
+import org.kohsuke.github.GitHub;
+
+public class GitHubOrgWebHookTest {
+
+    @Rule public JenkinsRule r = new JenkinsRule();
+    @Rule public WireMockRule wireMockRule = new WireMockRule(wireMockConfig().dynamicPort());
+
+    @Issue("JENKINS-58942")
+    @Test public void registerCustom() throws Exception {
+        System.setProperty("jenkins.hook.url", "https://mycorp/hook-proxy/");
+        wireMockRule.stubFor(get(urlEqualTo("/api/users/myorg")).willReturn(aResponse().withBody("{\"login\":\"myorg\"}")));
+        wireMockRule.stubFor(get(urlEqualTo("/api/orgs/myorg")).willReturn(aResponse().withBody("{\"login\":\"myorg\",\"html_url\":\"https://github.com/myorg\"}")));
+        wireMockRule.stubFor(get(urlEqualTo("/api/orgs/myorg/hooks")).willReturn(aResponse().withBody("[]")));
+        wireMockRule.stubFor(post(urlEqualTo("/api/orgs/myorg/hooks")).withRequestBody(matchingJsonPath("$.config.url", equalTo("https://mycorp/hook-proxy/github-webhook/"))).willReturn(aResponse().withBody("{}")));
+        GitHub hub = Connector.connect("http://localhost:" + wireMockRule.port() + "/api/", null);
+        try {
+            GitHubOrgWebHook.register(hub, "myorg");
+        } finally {
+            Connector.release(hub);
+        }
+    }
+
+}