diff --git a/backend/src/db/graphql/groups.js b/backend/src/db/graphql/groups.js
index 3a7f047d2..a0aef97b2 100644
--- a/backend/src/db/graphql/groups.js
+++ b/backend/src/db/graphql/groups.js
@@ -40,8 +40,8 @@ export const createGroupMutation = gql`
 `
 
 export const joinGroupMutation = gql`
-  mutation ($id: ID!, $userId: ID!) {
-    JoinGroup(id: $id, userId: $userId) {
+  mutation ($groupId: ID!, $userId: ID!) {
+    JoinGroup(groupId: $groupId, userId: $userId) {
       id
       name
       slug
diff --git a/backend/src/db/seed.js b/backend/src/db/seed.js
index 0010b09ef..1bd535456 100644
--- a/backend/src/db/seed.js
+++ b/backend/src/db/seed.js
@@ -408,28 +408,28 @@ const languages = ['de', 'en', 'es', 'fr', 'it', 'pt', 'pl']
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g0',
+          groupId: 'g0',
           userId: 'u2',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g0',
+          groupId: 'g0',
           userId: 'u3',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g0',
+          groupId: 'g0',
           userId: 'u4',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g0',
+          groupId: 'g0',
           userId: 'u6',
         },
       }),
@@ -480,35 +480,35 @@ const languages = ['de', 'en', 'es', 'fr', 'it', 'pt', 'pl']
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g1',
+          groupId: 'g1',
           userId: 'u1',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g1',
+          groupId: 'g1',
           userId: 'u2',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g1',
+          groupId: 'g1',
           userId: 'u5',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g1',
+          groupId: 'g1',
           userId: 'u6',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g1',
+          groupId: 'g1',
           userId: 'u7',
         },
       }),
@@ -567,28 +567,28 @@ const languages = ['de', 'en', 'es', 'fr', 'it', 'pt', 'pl']
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g2',
+          groupId: 'g2',
           userId: 'u4',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g2',
+          groupId: 'g2',
           userId: 'u5',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g2',
+          groupId: 'g2',
           userId: 'u6',
         },
       }),
       mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'g2',
+          groupId: 'g2',
           userId: 'u7',
         },
       }),
diff --git a/backend/src/middleware/permissionsMiddleware.js b/backend/src/middleware/permissionsMiddleware.js
index c8f97cd17..bbaff67d9 100644
--- a/backend/src/middleware/permissionsMiddleware.js
+++ b/backend/src/middleware/permissionsMiddleware.js
@@ -172,7 +172,7 @@ const isAllowedToJoinGroup = rule({
   cache: 'no_cache',
 })(async (_parent, args, { user, driver }) => {
   if (!(user && user.id)) return false
-  const { id: groupId, userId } = args
+  const { groupId, userId } = args
   // Wolle:
   // console.log('adminId: ', adminId)
   // console.log('groupId: ', groupId)
diff --git a/backend/src/schema/resolvers/groups.js b/backend/src/schema/resolvers/groups.js
index 5e401c28e..d34d62eb7 100644
--- a/backend/src/schema/resolvers/groups.js
+++ b/backend/src/schema/resolvers/groups.js
@@ -131,7 +131,7 @@ export default {
       }
     },
     JoinGroup: async (_parent, params, context, _resolveInfo) => {
-      const { id: groupId, userId } = params
+      const { groupId, userId } = params
       const session = context.driver.session()
       const writeTxResultPromise = session.writeTransaction(async (transaction) => {
         const joinGroupCypher = `
diff --git a/backend/src/schema/resolvers/groups.spec.js b/backend/src/schema/resolvers/groups.spec.js
index c81f976be..74f806b7b 100644
--- a/backend/src/schema/resolvers/groups.spec.js
+++ b/backend/src/schema/resolvers/groups.spec.js
@@ -316,11 +316,13 @@ describe('in mode: always clean db', () => {
   describe('JoinGroup', () => {
     describe('unauthenticated', () => {
       it('throws authorization error', async () => {
-        variables = {
-          id: 'not-existing-group',
-          userId: 'current-user',
-        }
-        const { errors } = await mutate({ mutation: joinGroupMutation, variables })
+        const { errors } = await mutate({
+          mutation: joinGroupMutation,
+          variables: {
+            groupId: 'not-existing-group',
+            userId: 'current-user',
+          },
+        })
         expect(errors[0]).toHaveProperty('message', 'Not Authorised!')
       })
     })
@@ -403,7 +405,7 @@ describe('in mode: always clean db', () => {
               mutate({
                 mutation: joinGroupMutation,
                 variables: {
-                  id: 'public-group',
+                  groupId: 'public-group',
                   userId: 'owner-of-closed-group',
                 },
               }),
@@ -426,7 +428,7 @@ describe('in mode: always clean db', () => {
                 mutate({
                   mutation: joinGroupMutation,
                   variables: {
-                    id: 'public-group',
+                    groupId: 'public-group',
                     userId: 'current-user',
                   },
                 }),
@@ -451,7 +453,7 @@ describe('in mode: always clean db', () => {
               mutate({
                 mutation: joinGroupMutation,
                 variables: {
-                  id: 'closed-group',
+                  groupId: 'closed-group',
                   userId: 'current-user',
                 },
               }),
@@ -474,7 +476,7 @@ describe('in mode: always clean db', () => {
                 mutate({
                   mutation: joinGroupMutation,
                   variables: {
-                    id: 'closed-group',
+                    groupId: 'closed-group',
                     userId: 'owner-of-closed-group',
                   },
                 }),
@@ -495,11 +497,13 @@ describe('in mode: always clean db', () => {
       describe('hidden group', () => {
         describe('joined by "owner-of-closed-group"', () => {
           it('throws authorization error', async () => {
-            variables = {
-              id: 'hidden-group',
-              userId: 'owner-of-closed-group',
-            }
-            const { errors } = await query({ query: groupMembersQuery, variables })
+            const { errors } = await query({
+              query: joinGroupMutation,
+              variables: {
+                groupId: 'hidden-group',
+                userId: 'owner-of-closed-group',
+              },
+            })
             expect(errors[0]).toHaveProperty('message', 'Not Authorised!')
           })
         })
@@ -511,7 +515,7 @@ describe('in mode: always clean db', () => {
                 mutate({
                   mutation: joinGroupMutation,
                   variables: {
-                    id: 'hidden-group',
+                    groupId: 'hidden-group',
                     userId: 'owner-of-hidden-group',
                   },
                 }),
@@ -622,14 +626,14 @@ describe('in mode: building up – separate for each resolver', () => {
         await mutate({
           mutation: joinGroupMutation,
           variables: {
-            id: 'public-group',
+            groupId: 'public-group',
             userId: 'owner-of-closed-group',
           },
         })
         await mutate({
           mutation: joinGroupMutation,
           variables: {
-            id: 'public-group',
+            groupId: 'public-group',
             userId: 'owner-of-hidden-group',
           },
         })
@@ -650,14 +654,14 @@ describe('in mode: building up – separate for each resolver', () => {
         await mutate({
           mutation: joinGroupMutation,
           variables: {
-            id: 'closed-group',
+            groupId: 'closed-group',
             userId: 'current-user',
           },
         })
         await mutate({
           mutation: joinGroupMutation,
           variables: {
-            id: 'closed-group',
+            groupId: 'closed-group',
             userId: 'owner-of-hidden-group',
           },
         })
@@ -1158,14 +1162,14 @@ describe('in mode: building up – separate for each resolver', () => {
       await mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'public-group',
+          groupId: 'public-group',
           userId: 'owner-of-closed-group',
         },
       })
       await mutate({
         mutation: joinGroupMutation,
         variables: {
-          id: 'public-group',
+          groupId: 'public-group',
           userId: 'owner-of-hidden-group',
         },
       })
diff --git a/backend/src/schema/types/type/Group.gql b/backend/src/schema/types/type/Group.gql
index 1f59d7cc4..9d2210a1a 100644
--- a/backend/src/schema/types/type/Group.gql
+++ b/backend/src/schema/types/type/Group.gql
@@ -115,7 +115,7 @@ type Mutation {
   DeleteGroup(id: ID!): Group
 
   JoinGroup(
-    id: ID!
+    groupId: ID!
     userId: ID!
   ): User