diff --git a/lib/bundler/source.rb b/lib/bundler/source.rb
index 251ddc4b7a2..2bcd47fb4f6 100644
--- a/lib/bundler/source.rb
+++ b/lib/bundler/source.rb
@@ -351,7 +351,7 @@ def load_spec_files
               s.relative_loaded_from = "#{@name}.gemspec"
               if expanded_path.join("bin").exist?
                 binaries = expanded_path.join("bin").children
-                binaries.reject! &:directory?
+                binaries.reject!{|p| p.directory? }
                 s.executables = binaries.map{|c| c.basename.to_s }
               end
             end