diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 029f905..689f612 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -29,7 +29,7 @@ module Autoscope
 
   def low_level_c_spec?
     return false unless described_class
-    return described_class.name =~ /^V8::C/
+    described_class.name =~ /^V8::C::/
   end
 
   def explicitly_defines_scope?