diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c
index f00c272521..6a70d49738 100644
--- a/src/backend/access/transam/multixact.c
+++ b/src/backend/access/transam/multixact.c
@@ -285,7 +285,7 @@ typedef struct MultiXactStateData
  * Pointers to the state data in shared memory
  *
  * The index of the last element of the OldestMemberMXactId and
- * OldestVisibleMXacId arrays can be obtained with GetMaxOldestSlot().
+ * OldestVisibleMXactId arrays can be obtained with GetMaxOldestSlot().
  */
 static MultiXactStateData *MultiXactState;
 static MultiXactId *OldestMemberMXactId;