diff --git a/src/pim-types.ts b/src/pim-types.ts
index 3a07fe3..fd40b33 100644
--- a/src/pim-types.ts
+++ b/src/pim-types.ts
@@ -368,6 +368,10 @@ export class ContactType implements PimType {
     return this.comp.getFirstPropertyValue("n");
   }
 
+  get bday() {
+    return this.comp.getFirstPropertyValue("bday");
+  }
+
   get group() {
     const kind = this.comp.getFirstPropertyValue("kind");
     return kind in ["group", "organization"];