diff --git a/problems/excel-sheet-column-title/excel_sheet_column_title.go b/problems/excel-sheet-column-title/excel_sheet_column_title.go
index 954d1d263..82cbd34ac 100644
--- a/problems/excel-sheet-column-title/excel_sheet_column_title.go
+++ b/problems/excel-sheet-column-title/excel_sheet_column_title.go
@@ -1,8 +1,8 @@
 package excel_sheet_column_title
 
 func convertToTitle(n int) string {
-	if n < 27 {
-		return string(n - 1 + 'A')
+	if n--; n < 26 {
+		return string(n + 'A')
 	}
-	return convertToTitle((n-1)/26) + string((n-1)%26+'A')
+	return convertToTitle(n/26) + string(n%26+'A')
 }