diff --git a/Python/ceval.c b/Python/ceval.c
index 3e0ff76..db9ce7d 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -2492,7 +2492,7 @@
 		else {
 			/* This check is expensive! */
 			if (PyErr_Occurred()) {
-				char buf[1024];
+				char buf[128];
 				sprintf(buf, "Stack unwind with exception "
 					"set and why=%d", why);
 				Py_FatalError(buf);