diff --git a/spec/ameba/rule/performance/minmax_after_map_spec.cr b/spec/ameba/rule/performance/minmax_after_map_spec.cr
index c0f4701f..e4462992 100644
--- a/spec/ameba/rule/performance/minmax_after_map_spec.cr
+++ b/spec/ameba/rule/performance/minmax_after_map_spec.cr
@@ -4,7 +4,7 @@ module Ameba::Rule::Performance
   subject = MinMaxAfterMap.new
 
   describe MinMaxAfterMap do
-    it "passes if there is no potential performance improvements" do
+    it "passes if there are no potential performance improvements" do
       expect_no_issues subject, <<-CRYSTAL
         %w[Alice Bob].map { |name| name.size }.min(2)
         %w[Alice Bob].map { |name| name.size }.max(2)