diff --git a/Library/Homebrew/extend/os/mac/hardware/cpu.rb b/Library/Homebrew/extend/os/mac/hardware/cpu.rb
index 7d08694d85..280525c4e7 100644
--- a/Library/Homebrew/extend/os/mac/hardware/cpu.rb
+++ b/Library/Homebrew/extend/os/mac/hardware/cpu.rb
@@ -152,7 +152,7 @@ module Hardware
       end
 
       def sysctl_int(key)
-        sysctl_n(key).to_i
+        sysctl_n(key).to_i & 0xffffffff
       end
 
       def sysctl_n(*keys)