diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
index ef14cbaf91..734a36822c 100644
--- a/test/ruby/test_compile_prism.rb
+++ b/test/ruby/test_compile_prism.rb
@@ -526,6 +526,7 @@ module Prism
     def test_prism_eval(source)
       $VERBOSE, verbose_bak = nil, $VERBOSE
 
+      source = "class Prism::TestCompilePrism\n#{source}\nend"
       begin
         compare_eval(source)