@@ -2301,6 +2301,9 @@ PyInit__struct(void)
     if (PyType_Ready(&PyStructType) < 0)
         return NULL;
 
+    if (PyType_Ready(&unpackiter_type) < 0)
+        return NULL;
+
     /* Check endian and swap in faster functions */
     {
         const formatdef *native = native_table;
Original file line number	Diff line number	Diff line change
`@@ -2301,6 +2301,9 @@ PyInit__struct(void)`
`2301`	`2301`	`if (PyType_Ready(&PyStructType) < 0)`
`2302`	`2302`	`return NULL;`
`2303`	`2303`
	`2304`	`+ if (PyType_Ready(&unpackiter_type) < 0)`
	`2305`	`+ return NULL;`
	`2306`	`+`
`2304`	`2307`	`/* Check endian and swap in faster functions */`
`2305`	`2308`	`{`
`2306`	`2309`	`const formatdef *native = native_table;`