diff --git a/Formula/potrace.rb b/Formula/potrace.rb
index 2376d2c6987..4b4cdc528fb 100644
--- a/Formula/potrace.rb
+++ b/Formula/potrace.rb
@@ -8,7 +8,7 @@ class Potrace < Formula
   livecheck do
     url "http://potrace.sourceforge.net/"
     strategy :page_match
-    regex(/href=.*?potrace[._-]v?(\d+(?:\.\d+)*)\.t/i)
+    regex(/href=.*?potrace[._-]v?(\d+(?:\.\d+)+)\.t/i)
   end
 
   bottle do