diff --git a/Library/Homebrew/test/messages_spec.rb b/Library/Homebrew/test/messages_spec.rb
index 0d5a5b4388..6212ced402 100644
--- a/Library/Homebrew/test/messages_spec.rb
+++ b/Library/Homebrew/test/messages_spec.rb
@@ -13,7 +13,7 @@ describe Messages do
     it "adds a caveat" do
       expect {
         messages.record_caveats(test_formula, "Zsh completions were installed")
-      }.to change { messages.caveats.count }.by(1)
+      }.to change(messages.caveats, :count).by(1)
     end
   end
 
@@ -27,7 +27,7 @@ describe Messages do
     it "adds to install_times" do
       expect {
         messages.package_installed(test_formula, elapsed_time)
-      }.to change { messages.install_times.count }.by(1)
+      }.to change(messages.install_times, :count).by(1)
     end
   end