diff --git a/src/py_object.cpp b/src/py_object.cpp
index 8c410ff..d3159f3 100644
--- a/src/py_object.cpp
+++ b/src/py_object.cpp
@@ -137,7 +137,7 @@ PyList& PyList::reverse() {
 
 PyObject* PyList::get_pyobject() const {
   PyObject* lst = PyList_New(items_.size());
-  for (uint i = 0; i < items_.size(); i++) {
+  for (unsigned int i = 0; i < items_.size(); i++) {
     PyList_SetItem(lst, i, items_[i]->get_pyobject());
   }
   return lst;
@@ -146,7 +146,7 @@ PyObject* PyList::get_pyobject() const {
 PyTuple::PyTuple() {}
 PyObject* PyTuple::get_pyobject() const {
   PyObject* tup = PyTuple_New(items_.size());
-  for (uint i = 0; i < items_.size(); i++) {
+  for (unsigned int i = 0; i < items_.size(); i++) {
     PyTuple_SetItem(tup, i, items_[i]->get_pyobject());
   }
   return tup;