diff --git a/src/hebrewcalendar/JewishDate.ts b/src/hebrewcalendar/JewishDate.ts
index 3c61604..59822c1 100644
--- a/src/hebrewcalendar/JewishDate.ts
+++ b/src/hebrewcalendar/JewishDate.ts
@@ -1259,6 +1259,7 @@ export class JewishDate {
           // if last day of year
           if (this.gregorianMonth === 12) {
             this.gregorianYear++;
+            this.gregorianMonth = 1;
           } else {
             this.gregorianMonth++;
           }