diff --git a/Python/getargs.c b/Python/getargs.c
index b676a5e..a848116 100644
--- a/Python/getargs.c
+++ b/Python/getargs.c
@@ -815,7 +815,7 @@
 #endif
 			else
 				return converterr("string", arg, msgbuf, bufsize);
-			if ((int)strlen(*p) != PyString_Size(arg))
+			if ((Py_ssize_t)strlen(*p) != PyString_Size(arg))
 				return converterr("string without null bytes",
 						  arg, msgbuf, bufsize);
 		}
@@ -882,7 +882,7 @@
 				format++;
 			}
 			else if (*p != NULL &&
-				 (int)strlen(*p) != PyString_Size(arg))
+				 (Py_ssize_t)strlen(*p) != PyString_Size(arg))
 				return converterr(
 					"string without null bytes or None", 
 					arg, msgbuf, bufsize);
@@ -1029,7 +1029,8 @@
 			   PyMem_Free()ing it after usage
 
 			*/
-			if ((int)strlen(PyString_AS_STRING(s)) != size) {
+			if ((Py_ssize_t)strlen(PyString_AS_STRING(s))
+								!= size) {
 				Py_DECREF(s);
 				return converterr(
 					"(encoded string without NULL bytes)",