diff --git a/src/interfaces.ts b/src/interfaces.ts
index 42fd5f0..0fa12ba 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -125,6 +125,12 @@ export interface CivicAddress {
    * Example: Joe's Barbershop
    */
   NAM?: string,
+  /**
+   * Unit (apartment, suite) \
+   * https://datatracker.ietf.org/doc/html/rfc5139#page-4 \
+   * Example: 12a
+   */
+  UNIT?: string,
   /**
    * Postal code \
    * Example: 10027-0401
diff --git a/src/pidf.ts b/src/pidf.ts
index 12b332a..b484801 100644
--- a/src/pidf.ts
+++ b/src/pidf.ts
@@ -63,6 +63,7 @@ export class Civic extends Location {
       FLR: Civic.getValueIfAvailable(node, 'FLR'),
       NAM: Civic.getValueIfAvailable(node, 'NAM'),
       PC: Civic.getValueIfAvailable(node, 'PC'),
+      UNIT: Civic.getValueIfAvailable(node, 'UNIT'),
     };
 
     return new Civic(addr, method);
@@ -97,6 +98,7 @@ export class Civic extends Location {
     Civic.addElementIfNotUndefined(doc, root, prefix, 'FLR', adr.FLR);
     Civic.addElementIfNotUndefined(doc, root, prefix, 'NAM', adr.NAM);
     Civic.addElementIfNotUndefined(doc, root, prefix, 'PC', adr.PC);
+    Civic.addElementIfNotUndefined(doc, root, prefix, 'UNIT', adr.UNIT);
 
     return root;
   }