diff --git a/Objects/capsule.c b/Objects/capsule.c
index 3d2d626..e25af6c 100644
--- a/Objects/capsule.c
+++ b/Objects/capsule.c
@@ -197,7 +197,7 @@
     PyObject *object = NULL;
     void *return_value = NULL;
     char *trace;
-    int name_length = (strlen(name) + 1) * sizeof(char);
+    size_t name_length = (strlen(name) + 1) * sizeof(char);
     char *name_dup = (char *)PyMem_MALLOC(name_length);
 
     if (!name_dup) {