diff --git a/__test__/server/api/campaign/campaign.test.js b/__test__/server/api/campaign/campaign.test.js
index e77cfc055..1fa8f8cc9 100644
--- a/__test__/server/api/campaign/campaign.test.js
+++ b/__test__/server/api/campaign/campaign.test.js
@@ -1005,7 +1005,7 @@ describe("Bulk Send", () => {
 
     // send some texts
     const bulkSendResult = await bulkSendMessages(
-      parseInt(assignmentId),
+      assignmentId,
       testTexterUser
     );
     resultTestFunction(bulkSendResult);
diff --git a/__test__/test_helpers.js b/__test__/test_helpers.js
index bc5db483e..10a1e6595 100644
--- a/__test__/test_helpers.js
+++ b/__test__/test_helpers.js
@@ -620,7 +620,7 @@ export async function sendMessage(campaignContactId, user, message) {
 
 export async function bulkSendMessages(assignmentId, user) {
   const query = `
-    mutation bulkSendMessage($assignmentId: Int!) {
+    mutation bulkSendMessage($assignmentId: String!) {
         bulkSendMessages(assignmentId: $assignmentId) {
           id
         }
diff --git a/src/api/schema.js b/src/api/schema.js
index d24ac6770..a6e8a56e2 100644
--- a/src/api/schema.js
+++ b/src/api/schema.js
@@ -324,7 +324,7 @@ const rootSchema = gql`
       updateData: JSON!
       fromCampaignStatsPage: Boolean
     ): ServiceManager
-    bulkSendMessages(assignmentId: Int!): [CampaignContact]
+    bulkSendMessages(assignmentId: String!): [CampaignContact]
     sendMessage(
       message: MessageInput!
       campaignContactId: String!
diff --git a/src/containers/AssignmentTexterContact.jsx b/src/containers/AssignmentTexterContact.jsx
index 26a388080..843f65439 100644
--- a/src/containers/AssignmentTexterContact.jsx
+++ b/src/containers/AssignmentTexterContact.jsx
@@ -652,7 +652,7 @@ const mutations = {
   }),
   bulkSendMessages: ownProps => assignmentId => ({
     mutation: gql`
-      mutation bulkSendMessages($assignmentId: Int!) {
+      mutation bulkSendMessages($assignmentId: String!) {
         bulkSendMessages(assignmentId: $assignmentId) {
           id
         }