diff --git a/action.yml b/action.yml
index fa4c08b..49e8b94 100644
--- a/action.yml
+++ b/action.yml
@@ -67,6 +67,10 @@ inputs:
     description: 'Base url of GitHub API'
     required: false
     default: ${{ github.api_url }}
+  GITHUB_SERVER_URL:
+    description: 'Base URL of GitHub web interface'
+    required: false
+    default: ${{ github.server_url }}
   ESCAPE:
     description: 'Escape all special Markdown characters'
     required: false
diff --git a/main.py b/main.py
index 41151c3..d005037 100644
--- a/main.py
+++ b/main.py
@@ -75,10 +75,9 @@ class GitHubClient(object):
         self.auto_assign = os.getenv('INPUT_AUTO_ASSIGN', 'false') == 'true'
         self.actor = os.getenv('INPUT_ACTOR')
         self.insert_issue_urls = os.getenv('INPUT_INSERT_ISSUE_URLS', 'false') == 'true'
-        if self.base_url == 'https://api.github.com/':
-            self.line_base_url = 'https://github.com/'
-        else:
-            self.line_base_url = self.base_url
+        self.line_base_url = os.getenv('INPUT_GITHUB_SERVER_URL')
+        if not self.line_base_url.endswith('/'):
+            self.line_base_url += '/'
         self.project = os.getenv('INPUT_PROJECT', None)
         # Retrieve the existing repo issues now so we can easily check them later.
         self._get_existing_issues()