diff --git a/pdb-utils/src/main/java/org/lucares/utils/StartOfInterval.java b/pdb-utils/src/main/java/org/lucares/utils/StartOfInterval.java
index 63e82ab..f88f033 100644
--- a/pdb-utils/src/main/java/org/lucares/utils/StartOfInterval.java
+++ b/pdb-utils/src/main/java/org/lucares/utils/StartOfInterval.java
@@ -56,6 +56,10 @@ public class StartOfInterval implements TemporalAdjuster {
                     result = result.with(ChronoField.DAY_OF_MONTH, 1);
                     break;
                 }
+                case YEARS: {
+                    result = result.with(ChronoField.MONTH_OF_YEAR, 1);
+                    break;
+                }
                 default:
                     throw new IllegalArgumentException("Unexpected value: " + unit);
                 }