1 files changed, 4 insertions, 2 deletions
diff --git a/lib/rubygems/local_remote_options.rb b/lib/rubygems/local_remote_options.rb
index 597b87ea03..fe09e34e54 100644
--- a/lib/rubygems/local_remote_options.rb
+++ b/lib/rubygems/local_remote_options.rb
@@ -24,8 +24,10 @@ module Gem::LocalRemoteOptions
         raise OptionParser::InvalidArgument, value
       end
 
-      unless ['http', 'https', 'file', 's3'].include?(uri.scheme)
-         raise OptionParser::InvalidArgument, value
+      valid_uri_schemes = ["http", "https", "file", "s3"]
+      unless valid_uri_schemes.include?(uri.scheme)
+        msg =  "Invalid uri scheme for #{value}\nPreface URLs with one of #{valid_uri_schemes.map{|s| "#{s}://"}}"
+        raise ArgumentError, msg
       end
 
       value