diff --git a/lib/github/linked_issue.rb b/lib/github/linked_issue.rb
index 72b9e6517..b3a212096 100644
--- a/lib/github/linked_issue.rb
+++ b/lib/github/linked_issue.rb
@@ -97,7 +97,7 @@ class GitHub
     end
 
     def variables!(url)
-      if url !~ %r{^https://([^/]+)/([^/]+)/([^/]+)/issues/(\d+)$}
+      if url !~ %r{^https?://([^/]+)/([^/]+)/([^/]+)/issues/(\d+)$}
         raise Exceptions::UnprocessableEntity, 'Invalid GitHub issue link format'
       end
 
diff --git a/lib/gitlab/linked_issue.rb b/lib/gitlab/linked_issue.rb
index 144f7cfd9..4d05a293a 100644
--- a/lib/gitlab/linked_issue.rb
+++ b/lib/gitlab/linked_issue.rb
@@ -97,7 +97,7 @@ class GitLab
     end
 
     def variables(url)
-      if url !~ %r{^https://([^/]+)/(.*)/-/issues/(\d+)$}
+      if url !~ %r{^https?://([^/]+)/(.*)/-/issues/(\d+)$}
         raise Exceptions::UnprocessableEntity, 'Invalid GitLab issue link format'
       end