diff --git a/ext/-test-/path_to_class/path_to_class.c b/ext/-test-/path_to_class/path_to_class.c
index 9b88b48d40..c8c2831b09 100644
--- a/ext/-test-/path_to_class/path_to_class.c
+++ b/ext/-test-/path_to_class/path_to_class.c
@@ -1,9 +1,15 @@
 #include "ruby.h"
 
+static VALUE
+path_to_class(VALUE klass, VALUE path)
+{
+    return rb_path_to_class(path);
+}
+
 void
 Init_path_to_class(void)
 {
     VALUE klass = rb_path2class("Test_PathToClass");
 
-    rb_define_singleton_method(klass, "path_to_class", rb_path_to_class, 1);
+    rb_define_singleton_method(klass, "path_to_class", path_to_class, 1);
 }