diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 487c765..9210e24 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -121,7 +121,7 @@
    added at about the same rate as old blocks are being freed.
  */
 
-#define MAXFREEBLOCKS 10
+#define MAXFREEBLOCKS 16
 static Py_ssize_t numfreeblocks = 0;
 static block *freeblocks[MAXFREEBLOCKS];