diff --git a/src/main/java/org/jenkinsci/plugins/ghprb/GhprbRepository.java b/src/main/java/org/jenkinsci/plugins/ghprb/GhprbRepository.java
index 918cdbf2c..56d976825 100644
--- a/src/main/java/org/jenkinsci/plugins/ghprb/GhprbRepository.java
+++ b/src/main/java/org/jenkinsci/plugins/ghprb/GhprbRepository.java
@@ -32,6 +32,7 @@
 import java.io.UnsupportedEncodingException;
 import java.net.URL;
 import java.net.URLEncoder;
+import java.util.Arrays;
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -52,6 +53,9 @@ public class GhprbRepository implements Saveable {
 
     private static final transient EnumSet<GHEvent> HOOK_EVENTS = EnumSet.of(GHEvent.ISSUE_COMMENT, GHEvent.PULL_REQUEST);
 
+    private static final List<String> ALLOWED_ACTIONS = Arrays.asList("edited", "labeled", "opened", "reopened", "synchronize",
+            "unlabeled");
+
     private final String reponame;
 
     private final Map<Integer, GhprbPullRequest> pullRequests;
@@ -389,7 +393,7 @@ void onPullRequestHook(PullRequest pr) throws IOException {
             doSave = true;
         } else if (!trigger.isActive()) {
             LOGGER.log(Level.FINE, "Not processing Pull request since the build is disabled");
-        } else if ("edited".equals(action) || "opened".equals(action) || "reopened".equals(action) || "synchronize".equals(action)) {
+        } else if (ALLOWED_ACTIONS.contains(action)) {
             GhprbPullRequest pull = getPullRequest(ghpr, number);
             pull.check(ghpr, true);
             doSave = true;