Raise ArgumentError for argument errors

1 files changed, 2 insertions, 2 deletions

diff --git a/Library/Homebrew/software_spec.rb b/Library/Homebrew/software_spec.rb
index 88370e0fa..fe0277adb 100644
--- a/Library/Homebrew/software_spec.rb
+++ b/Library/Homebrew/software_spec.rb
@@ -78,8 +78,8 @@ class SoftwareSpec
   def option name, description=nil
     name = 'c++11' if name == :cxx11
     name = name.to_s if Symbol === name
-    raise "Option name is required." if name.empty?
-    raise "Options should not start with dashes." if name[0, 1] == "-"
+    raise ArgumentError, "option name is required" if name.empty?
+    raise ArgumentError, "options should not start with dashes" if name.start_with?("-")
     build.add(name, description)
   end