diff --git a/.rubocop.yml b/.rubocop.yml
index 9b5067851..45c299599 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -469,6 +469,9 @@ Style/HashSyntax:
 Style/IdenticalConditionalBranches:
   Enabled: true
 
+Style/IfWithBooleanLiteralBranches:
+  Enabled: true
+
 Style/MethodDefParentheses:
   Enabled: true
 
diff --git a/app/models/poll/booth_assignment.rb b/app/models/poll/booth_assignment.rb
index 5af8e804c..e525b6ed7 100644
--- a/app/models/poll/booth_assignment.rb
+++ b/app/models/poll/booth_assignment.rb
@@ -12,7 +12,7 @@ class Poll
     has_many :recounts
 
     def shifts?
-      shifts.empty? ? false : true
+      !shifts.empty?
     end
 
     def unable_to_destroy?