diff --git a/appraisal.gemspec b/appraisal.gemspec
index 3689aed7..d136a37f 100644
--- a/appraisal.gemspec
+++ b/appraisal.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |s|
 
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
-  s.executables   = `git ls-files -- exe/*`.split("\n").map{ |f| File.basename(f) }
+  s.executables   = `git ls-files -- exe/*`.split("\n").map { |f| File.basename(f) }
   s.bindir        = "exe"
 
   s.required_ruby_version = ">= 2.3.0"