diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-03-16-17-24-44.gh-issue-102701.iNGVaS.rst b/Misc/NEWS.d/next/Core and Builtins/2023-03-16-17-24-44.gh-issue-102701.iNGVaS.rst
new file mode 100644
index 00000000000000..4e1f31893377ba
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2023-03-16-17-24-44.gh-issue-102701.iNGVaS.rst	
@@ -0,0 +1 @@
+Fix overflow when creating very large dict.
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 227e438a8dfffc..53f9a380346a0d 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -596,7 +596,7 @@ new_keys_object(PyInterpreterState *interp, uint8_t log2_size, bool unicode)
 
     assert(log2_size >= PyDict_LOG_MINSIZE);
 
-    usable = USABLE_FRACTION(1<<log2_size);
+    usable = USABLE_FRACTION((size_t)1<<log2_size);
     if (log2_size < 8) {
         log2_bytes = log2_size;
     }