diff --git a/Library/Homebrew/mach.rb b/Library/Homebrew/mach.rb
index a7a4b1a70c..54e65a0a92 100644
--- a/Library/Homebrew/mach.rb
+++ b/Library/Homebrew/mach.rb
@@ -46,7 +46,7 @@ module ArchitectureListExtension
 end
 
 module MachO
-  OTOOL_RX = /\t(.*) \(compatibility version (\d+\.)*\d+, current version (\d+\.)*\d+\)/
+  OTOOL_RX = /\t(.*) \(compatibility version (?:\d+\.)*\d+, current version (?:\d+\.)*\d+\)/
 
   # Mach-O binary methods, see:
   # /usr/include/mach-o/loader.h