diff --git a/php_python_internal.h b/php_python_internal.h
index f099a4c..8b6a001 100644
--- a/php_python_internal.h
+++ b/php_python_internal.h
@@ -110,6 +110,6 @@ int pip_pyobject_to_zval(PyObject *o, zval *zv TSRMLS_DC);
 PyObject * pip_args_to_tuple(int argc, int start TSRMLS_DC);
 
 /* Object Representations */
-int python_str(PyObject *o, char **buffer, int *length TSRMLS_DC);
+int python_str(PyObject *o, char **buffer, Py_ssize_t *length TSRMLS_DC);
 
 #endif /* PHP_PYTHON_INTERNAL_H */
diff --git a/python_convert.c b/python_convert.c
index e44d14d..b3393cb 100644
--- a/python_convert.c
+++ b/python_convert.c
@@ -86,7 +86,7 @@ pip_hash_to_dict(zval *hash TSRMLS_DC)
 	PyObject *dict, *integer;
 	zval **entry;
 	char *string_key;
-	long num_key;
+	unsigned long num_key;
 
 	PHP_PYTHON_THREAD_ASSERT();
 
@@ -136,7 +136,7 @@ pip_zobject_to_pyobject(zval *obj TSRMLS_DC)
 	PyObject *dict, *str;
 	zval **entry;
 	char *string_key;
-	long num_key;
+	unsigned long num_key;
 
 	PHP_PYTHON_THREAD_ASSERT();
 
@@ -164,7 +164,7 @@ pip_zobject_to_pyobject(zval *obj TSRMLS_DC)
 				PyDict_SetItemString(dict, string_key, item);
 				break;
 			case HASH_KEY_IS_LONG:
-				str = PyString_FromFormat("%d", num_key);
+				str = PyString_FromFormat("%lu", num_key);
 				PyObject_SetItem(dict, str, item);
 				Py_DECREF(str);
 				break;
@@ -309,7 +309,8 @@ pip_mapping_to_hash(PyObject *o, HashTable *ht TSRMLS_DC)
 	PyObject *keys, *key, *str, *item;
 	zval *v;
 	char *name;
-	int i, size, name_len;
+	int i, size;
+	Py_ssize_t name_len;
 	int status = FAILURE;
 
 	PHP_PYTHON_THREAD_ASSERT();
@@ -582,7 +583,7 @@ pip_args_to_tuple(int argc, int start TSRMLS_DC)
 /* {{{ python_str(PyObject *o, char **buffer, int *length)
    Returns the NUL-terminated string representation of a Python object. */
 int
-python_str(PyObject *o, char **buffer, int *length TSRMLS_DC)
+python_str(PyObject *o, char **buffer, Py_ssize_t *length TSRMLS_DC)
 {
 	PyObject *str;
 	int ret = -1;
diff --git a/python_streams.c b/python_streams.c
index a3e7904..dc6e3e5 100644
--- a/python_streams.c
+++ b/python_streams.c
@@ -85,7 +85,7 @@ OutputStream_writelines(OutputStream *self, PyObject *args)
 	PyObject *iterator;
 	PyObject *item;
 	char *str;
-	int len;
+	Py_ssize_t len;
 
 	if (!PyArg_ParseTuple(args, "O:writelines", &sequence))
         return NULL;