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-rw-r--r--lib/rubygems/ext/rake_builder.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rubygems/ext/rake_builder.rb b/lib/rubygems/ext/rake_builder.rb
index 682f1253e1..ec904e6c11 100644
--- a/lib/rubygems/ext/rake_builder.rb
+++ b/lib/rubygems/ext/rake_builder.rb
@@ -9,7 +9,7 @@ class Gem::Ext::RakeBuilder < Gem::Ext::Builder
def self.build(extension, directory, dest_path, results, args=[], lib_dir=nil)
if File.basename(extension) =~ /mkrf_conf/i then
- cmd = "#{Gem.ruby} #{File.basename extension}"
+ cmd = "#{Gem.ruby} #{File.basename extension}".dup
cmd << " #{args.join " "}" unless args.empty?
run cmd, results
end