diff --git a/plugins-compat-tester/src/main/java/org/jenkins/tools/test/PluginCompatTester.java b/plugins-compat-tester/src/main/java/org/jenkins/tools/test/PluginCompatTester.java
index 6cf128c5e..b6357ba68 100644
--- a/plugins-compat-tester/src/main/java/org/jenkins/tools/test/PluginCompatTester.java
+++ b/plugins-compat-tester/src/main/java/org/jenkins/tools/test/PluginCompatTester.java
@@ -608,8 +608,9 @@ private UpdateSite.Data scanWAR(File war, Map<String, String> pluginGroupIds) th
                     top.put("core", new JSONObject().accumulate("name", "core").accumulate("version", m.group(1)).accumulate("url", "https://foobar"));
                 }
 
-                //TODO: should it also scan detached plugins info?
-                m = Pattern.compile("WEB-INF/(?:optional-)?plugins/([^/.]+)[.][hj]pi").matcher(name);
+                // We should also scan detached plugins to make sure we get the proper groupId for detached not using the
+                // default org.jenkins-ci one
+                m = Pattern.compile("WEB-INF/(?:(optional-|detached-))?plugins/([^/.]+)[.][hj]pi").matcher(name);
                 if (m.matches()) {
                     JSONObject plugin = new JSONObject().accumulate("url", "");
                     InputStream is = jf.getInputStream(entry);