diff --git a/src/public/internal.c b/src/public/internal.c
index f291b3d5..82a5a2b2 100644
--- a/src/public/internal.c
+++ b/src/public/internal.c
@@ -231,8 +231,8 @@ bool pk_loadmethod(py_StackRef self, py_Name name) {
 
     if(ti->getunboundmethod) {
         bool ok = ti->getunboundmethod(self, name);
-        assert(py_retval()->type == tp_nativefunc || py_retval()->type == tp_function);
         if(ok) {
+            assert(py_retval()->type == tp_nativefunc || py_retval()->type == tp_function);
             self[0] = *py_retval();
             self[1] = self_bak;
             return true;