diff --git a/Library/Homebrew/cask/cmd/uninstall.rb b/Library/Homebrew/cask/cmd/uninstall.rb
index dbbdd328d5..1700482a65 100644
--- a/Library/Homebrew/cask/cmd/uninstall.rb
+++ b/Library/Homebrew/cask/cmd/uninstall.rb
@@ -46,7 +46,7 @@ module Cask
           next if (versions = cask.versions).empty?
 
           puts <<~EOS
-            #{cask} #{versions.to_sentence} #{versions.count == 1 ? "is" : "are"} still installed.
+            #{cask} #{versions.to_sentence} #{(versions.count == 1) ? "is" : "are"} still installed.
             Remove #{(versions.count == 1) ? "it" : "them all"} with `brew uninstall --cask --force #{cask}`.
           EOS
         end
diff --git a/Library/Homebrew/cmd/developer.rb b/Library/Homebrew/cmd/developer.rb
index 60e1ef744a..131f18cef5 100755
--- a/Library/Homebrew/cmd/developer.rb
+++ b/Library/Homebrew/cmd/developer.rb
@@ -40,7 +40,7 @@ module Homebrew
     case args.named.first
     when nil, "state"
       if env_vars.any?
-        puts "Developer mode is enabled because #{env_vars.to_sentence} #{env_vars.count == 1 ? "is" : "are"} set."
+        puts "Developer mode is enabled because #{env_vars.to_sentence} #{(env_vars.count == 1) ? "is" : "are"} set."
       elsif Homebrew::Settings.read("devcmdrun") == "true"
         puts "Developer mode is enabled."
       else
diff --git a/Library/Homebrew/uninstall.rb b/Library/Homebrew/uninstall.rb
index 3ecc965a6d..a6f366f448 100644
--- a/Library/Homebrew/uninstall.rb
+++ b/Library/Homebrew/uninstall.rb
@@ -52,7 +52,7 @@ module Homebrew
               if rack.directory?
                 versions = rack.subdirs.map(&:basename)
                 puts <<~EOS
-                  #{keg.name} #{versions.to_sentence} #{versions.count == 1 ? "is" : "are"} still installed.
+                  #{keg.name} #{versions.to_sentence} #{(versions.count == 1) ? "is" : "are"} still installed.
                   To remove all versions, run:
                     brew uninstall --force #{keg.name}
                 EOS
@@ -136,8 +136,8 @@ module Homebrew
       end
 
       def are_required_by_deps
-        "#{reqs.count == 1 ? "is" : "are"} required by #{deps.to_sentence}, " \
-          "which #{deps.count == 1 ? "is" : "are"} currently installed"
+        "#{(reqs.count == 1) ? "is" : "are"} required by #{deps.to_sentence}, " \
+          "which #{(deps.count == 1) ? "is" : "are"} currently installed"
       end
     end