diff --git a/spec/lib/regexp_preview/single_line_spec.rb b/spec/lib/regexp_preview/single_line_spec.rb
index 99d263e..cec7b62 100644
--- a/spec/lib/regexp_preview/single_line_spec.rb
+++ b/spec/lib/regexp_preview/single_line_spec.rb
@@ -7,8 +7,8 @@ describe RegexpPreview::SingleLine do
     describe "format" do
       let :params do
         {
-          regexp: "(?<regexp>regexp)",
           time_format: "time_format",
+          regexp: "(?<category>\[.+\])",
         }
       end