diff --git a/goruby.c b/goruby.c
index 6095fc0894..8f7cf30be4 100644
--- a/goruby.c
+++ b/goruby.c
@@ -20,7 +20,7 @@ RUBY_EXTERN void ruby_init_ext(const char *name, void (*init)(void));
 static VALUE
 init_golf(VALUE arg)
 {
-    ruby_init_ext("golf", Init_golf);
+    ruby_init_ext("golf.so", Init_golf);
     return arg;
 }