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-rw-r--r--Modules/zlibmodule.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index 4b39aae..b40e081 100644
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -573,7 +573,7 @@ save_unconsumed_input(compobject *self, int err)
Py_ssize_t old_size = PyBytes_GET_SIZE(self->unused_data);
Py_ssize_t new_size;
PyObject *new_data;
- if (self->zst.avail_in > PY_SSIZE_T_MAX - old_size) {
+ if ((Py_ssize_t)self->zst.avail_in > PY_SSIZE_T_MAX - old_size) {
PyErr_NoMemory();
return -1;
}