diff --git a/Objects/stringlib/formatter.h b/Objects/stringlib/formatter.h
index 12e2931..f8f265c 100644
--- a/Objects/stringlib/formatter.h
+++ b/Objects/stringlib/formatter.h
@@ -586,7 +586,7 @@
     }
 
     /* Insert the grouping, if any, after the uppercasing of 'X', so we can
-       ensure that grouping chars won't be affeted. */
+       ensure that grouping chars won't be affected. */
     if (n_grouping_chars && format->type == 'n') {
 	    /* We know this can't fail, since we've already
 	       reserved enough space. */