diff --git a/Python/bootstrap_hash.c b/Python/bootstrap_hash.c
index 793c646..eb848c8 100644
--- a/Python/bootstrap_hash.c
+++ b/Python/bootstrap_hash.c
@@ -55,8 +55,6 @@
 static int
 win32_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
 {
-    Py_ssize_t chunk;
-
     if (hCryptProv == 0)
     {
         if (win32_urandom_init(raise) == -1) {
@@ -66,8 +64,8 @@
 
     while (size > 0)
     {
-        chunk = size > INT_MAX ? INT_MAX : size;
-        if (!CryptGenRandom(hCryptProv, (DWORD)chunk, buffer))
+        DWORD chunk = (DWORD)Py_MIN(size, PY_DWORD_MAX);
+        if (!CryptGenRandom(hCryptProv, chunk, buffer))
         {
             /* CryptGenRandom() failed */
             if (raise) {