diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 0522c7878f..6aeb187499 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -584,7 +584,9 @@ class FormulaAuditor
     # People will run into mixed content sometimes, but we should enforce and then add
     # exemptions as they are discovered. Treat mixed content on homepages as a bug.
     # Justify each exemptions with a code comment so we can keep track here.
-    if homepage =~ %r{^http://[^/]*github\.io/}
+    case homepage
+    when %r{^http://[^/]*\.github\.io/},
+         %r{^http://[^/]*\.sourceforge\.io/}
       problem "Please use https:// for #{homepage}"
     end
 
diff --git a/Library/Homebrew/test/audit_test.rb b/Library/Homebrew/test/audit_test.rb
index b1ccb1e103..9165edef1e 100644
--- a/Library/Homebrew/test/audit_test.rb
+++ b/Library/Homebrew/test/audit_test.rb
@@ -434,6 +434,7 @@ class FormulaAuditorTests < Homebrew::TestCase
       "sf1" => "http://foo.sourceforge.net/",
       "sf2" => "http://foo.sourceforge.net",
       "sf3" => "http://foo.sf.net/",
+      "sf4" => "http://foo.sourceforge.io/",
       "waldo" => "http://www.gnu.org/waldo",
     }