diff --git a/projects/Time/14/org/joda/time/chrono/BasicMonthOfYearDateTimeField.java b/projects/Time/14/org/joda/time/chrono/BasicMonthOfYearDateTimeField.java
index afca44e..2892a2d 100644
--- a/projects/Time/14/org/joda/time/chrono/BasicMonthOfYearDateTimeField.java
+++ b/projects/Time/14/org/joda/time/chrono/BasicMonthOfYearDateTimeField.java
@@ -206,7 +206,12 @@ public int[] add(ReadablePartial partial, int fieldIndex, int[] values, int valu
         if (valueToAdd == 0) {
             return values;
         }
+        if (partial.size() > 0 && partial.getFieldType(0).equals(DateTimeFieldType.monthOfYear()) && fieldIndex == 0) {
             // month is largest field and being added to, such as month-day
+            int curMonth0 = partial.getValue(0) - 1;
+            int newMonth = ((curMonth0 + (valueToAdd % 12) + 12) % 12) + 1;
+            return set(partial, 0, values, newMonth);
+        }
         if (DateTimeUtils.isContiguous(partial)) {
             long instant = 0L;
             for (int i = 0, isize = partial.size(); i < isize; i++) {