diff --git a/object.go b/object.go
index a346234..ec1e468 100644
--- a/object.go
+++ b/object.go
@@ -37,7 +37,7 @@ func (o gitObject) Type() ObjectType {
 	return ObjectType(C.git_object_type(o.ptr))
 }
 
-func (o gitObject) Free() {
+func (o *gitObject) Free() {
 	runtime.SetFinalizer(o, nil)
 	C.git_commit_free(o.ptr)
 }