diff --git a/src/main/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertService.java b/src/main/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertService.java
index 502b1e30..868556bf 100644
--- a/src/main/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertService.java
+++ b/src/main/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertService.java
@@ -328,6 +328,7 @@ public void unpublishAdvert(UUID advertId) {
         }
 
         advert.setStatus(GrantAdvertStatus.DRAFT);
+        advert.setContentfulSlug(null);
         advert.setUnpublishedDate(Instant.now());
 
         save(advert);
diff --git a/src/test/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertServiceTest.java b/src/test/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertServiceTest.java
index f411e6c7..7ce06cb0 100644
--- a/src/test/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertServiceTest.java
+++ b/src/test/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertServiceTest.java
@@ -1067,6 +1067,7 @@ void unpublishAdvert_UnpublishesAdvertFromContentful_AndSetsStatusToDraftInDb()
             assertThat(advertCaptor.getValue().getId()).isEqualTo(grantAdvertId);
             assertThat(advertCaptor.getValue().getStatus()).isEqualTo(GrantAdvertStatus.DRAFT);
             assertThat(advertCaptor.getValue().getUnpublishedDate()).isNotNull();
+            assertThat(advertCaptor.getValue().getContentfulSlug()).isNull();
         }
 
         @Test
@@ -1097,6 +1098,7 @@ void unpublishAdvertThroughLambda_successfullyUnpublishedAdvert() {
             assertThat(advertCaptor.getValue().getId()).isEqualTo(grantAdvertId);
             assertThat(advertCaptor.getValue().getStatus()).isEqualTo(GrantAdvertStatus.DRAFT);
             assertThat(advertCaptor.getValue().getUnpublishedDate()).isNotNull();
+            assertThat(advertCaptor.getValue().getContentfulSlug()).isNull();
         }
 
     }