@@ -2006,6 +2006,7 @@ _PyMarshal_WriteObjectToString(PyObject *x, int version, int allow_code)
     if (wf.writer == NULL) {
         return NULL;
     }
+    wf.writer->overallocate = 0;
     wf.ptr = wf.buf = PyBytesWriter_GetData(wf.writer);
     wf.end = wf.ptr + PyBytesWriter_GetSize(wf.writer);
     wf.error = WFERR_OK;
Original file line number	Diff line number	Diff line change
`@@ -2006,6 +2006,7 @@ _PyMarshal_WriteObjectToString(PyObject *x, int version, int allow_code)`
`2006`	`2006`	`if (wf.writer == NULL) {`
`2007`	`2007`	`return NULL;`
`2008`	`2008`	`}`
	`2009`	`+ wf.writer->overallocate = 0;`
`2009`	`2010`	`wf.ptr = wf.buf = PyBytesWriter_GetData(wf.writer);`
`2010`	`2011`	`wf.end = wf.ptr + PyBytesWriter_GetSize(wf.writer);`
`2011`	`2012`	`wf.error = WFERR_OK;`