diff --git a/mercurial/hgweb/hgweb_mod.py b/mercurial/hgweb/hgweb_mod.py
--- a/mercurial/hgweb/hgweb_mod.py
+++ b/mercurial/hgweb/hgweb_mod.py
@@ -136,7 +136,7 @@
         logourl = self.config('web', 'logourl')
         logoimg = self.config('web', 'logoimg')
         staticurl = (self.config('web', 'staticurl')
-                     or req.apppath + '/static/')
+                     or req.apppath.rstrip('/') + '/static/')
         if not staticurl.endswith('/'):
             staticurl += '/'
 
diff --git a/mercurial/hgweb/hgwebdir_mod.py b/mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py
+++ b/mercurial/hgweb/hgwebdir_mod.py
@@ -514,7 +514,7 @@
         logourl = config('web', 'logourl')
         logoimg = config('web', 'logoimg')
         staticurl = (config('web', 'staticurl')
-                     or req.apppath + '/static/')
+                     or req.apppath.rstrip('/') + '/static/')
         if not staticurl.endswith('/'):
             staticurl += '/'