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 41c4c662..b4f1dc21 100644
--- a/src/main/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertService.java
+++ b/src/main/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertService.java
@@ -319,6 +319,7 @@ public void unpublishAdvert(UUID advertId) {
 
         contentfulManagementClient.entries().unPublish(contentfulAdvert);
         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 5b4cb5f4..cf8b691b 100644
--- a/src/test/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertServiceTest.java
+++ b/src/test/java/gov/cabinetoffice/gap/adminbackend/services/GrantAdvertServiceTest.java
@@ -1044,6 +1044,7 @@ 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
@@ -1071,6 +1072,7 @@ 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();
         }
 
     }