diff --git a/Objects/longobject.c b/Objects/longobject.c
index f7c2e3a..7af5caf 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -3020,7 +3020,7 @@
  * of slices, each with a->ob_size digits, and multiply the slices by a,
  * one at a time.  This gives k_mul balanced inputs to work with, and is
  * also cache-friendly (we compute one double-width slice of the result
- * at a time, then move on, never bactracking except for the helpful
+ * at a time, then move on, never backtracking except for the helpful
  * single-width slice overlap between successive partial sums).
  */
 static PyLongObject *