diff --git a/lib/appraisal/bundler_dsl.rb b/lib/appraisal/bundler_dsl.rb
index f350235..65e85ad 100644
--- a/lib/appraisal/bundler_dsl.rb
+++ b/lib/appraisal/bundler_dsl.rb
@@ -109,7 +109,9 @@ def git_source(source, &block)
     private
 
     def eval_gemfile_entry
-      @eval_gemfile.map { |(p, c)| "eval_gemfile(#{p.inspect}#{", #{c.inspect}" if c})" } * "\n\n"
+      @eval_gemfile.map do |(p, c)|
+        "eval_gemfile(#{p.inspect}#{", #{c.inspect}" if c})"
+      end * "\n\n"
     end
 
     alias_method :eval_gemfile_entry_for_dup, :eval_gemfile_entry