diff --git "a/.\\Python-3.5.0rc1/Modules/_collectionsmodule.c" "b/.\\Python-3.5.0rc1/Modules/_collectionsmodule.c"
index 830c5b8..c6c7037 100644
--- "a/.\\Python-3.5.0rc1/Modules/_collectionsmodule.c"
+++ "b/.\\Python-3.5.0rc1/Modules/_collectionsmodule.c"
@@ -137,7 +137,7 @@ newblock(Py_ssize_t len) {
         numfreeblocks--;
         return freeblocks[numfreeblocks];
     }
-    b = PyMem_Malloc(sizeof(block));
+    b = PyMem_Calloc(sizeof(block), 1);
     if (b != NULL) {
         return b;
     }