diff --git a/bindings/python/wrapper_top.c b/bindings/python/wrapper_top.c
index df3359ec..22d20c9a 100644
--- a/bindings/python/wrapper_top.c
+++ b/bindings/python/wrapper_top.c
@@ -7,6 +7,8 @@
 #include "../../lasso/utils.h"
 #include "../utils.c"
 
+#define PY_SSIZE_T_CLEAN
+
 #if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
 typedef int Py_ssize_t;
 #define PY_SSIZE_T_MAX INT_MAX