diff --git a/spec/std/string_spec.cr b/spec/std/string_spec.cr
index ddf4bdabd67d..5a2cd00b978a 100644
--- a/spec/std/string_spec.cr
+++ b/spec/std/string_spec.cr
@@ -2347,7 +2347,7 @@ describe "String" do
     end
   end
 
-  describe "invalide utf-8 byte sequence" do
+  describe "invalid UTF-8 byte sequence" do
     it "gets size" do
       string = String.new(Bytes[255, 0, 0, 0, 65])
       string.size.should eq(5)