diff --git a/.env.template b/.env.template
index a54df82e..a9ae63d7 100644
--- a/.env.template
+++ b/.env.template
@@ -13,3 +13,7 @@ TURN_STATIC_AUTH_SECRET=
 
 # The email address used by Let's encrypt to send renewal warnings (compulsory)
 ACME_EMAIL=
+
+MAX_PER_GROUP=4
+MAX_USERNAME_LENGTH=8
+
diff --git a/back/src/Enum/EnvironmentVariable.ts b/back/src/Enum/EnvironmentVariable.ts
index 8736a856..81693a98 100644
--- a/back/src/Enum/EnvironmentVariable.ts
+++ b/back/src/Enum/EnvironmentVariable.ts
@@ -11,6 +11,7 @@ const HTTP_PORT = parseInt(process.env.HTTP_PORT || '8080') || 8080;
 const GRPC_PORT = parseInt(process.env.GRPC_PORT || '50051') || 50051;
 export const SOCKET_IDLE_TIMER = parseInt(process.env.SOCKET_IDLE_TIMER as string) || 30; // maximum time (in second) without activity before a socket is closed
 export const TURN_STATIC_AUTH_SECRET = process.env.TURN_STATIC_AUTH_SECRET || '';
+export const MAX_PER_GROUP = parseInt(process.env.MAX_PER_GROUP || '4');
 
 export {
     MINIMUM_DISTANCE,
diff --git a/back/src/Model/Group.ts b/back/src/Model/Group.ts
index f26a0e0d..ffe7a78a 100644
--- a/back/src/Model/Group.ts
+++ b/back/src/Model/Group.ts
@@ -4,9 +4,9 @@ import {PositionInterface} from "_Model/PositionInterface";
 import {Movable} from "_Model/Movable";
 import {PositionNotifier} from "_Model/PositionNotifier";
 import {gaugeManager} from "../Services/GaugeManager";
+import {MAX_PER_GROUP} from "../Enum/EnvironmentVariable";
 
 export class Group implements Movable {
-    static readonly MAX_PER_GROUP = 4;
 
     private static nextId: number = 1;
 
@@ -88,7 +88,7 @@ export class Group implements Movable {
     }
 
     isFull(): boolean {
-        return this.users.size >= Group.MAX_PER_GROUP;
+        return this.users.size >= MAX_PER_GROUP;
     }
 
     isEmpty(): boolean {
diff --git a/docker-compose.single-domain.yaml b/docker-compose.single-domain.yaml
index 0bd1dcb6..1a390f4c 100644
--- a/docker-compose.single-domain.yaml
+++ b/docker-compose.single-domain.yaml
@@ -116,6 +116,7 @@ services:
       ADMIN_API_TOKEN: "$ADMIN_API_TOKEN"
       JITSI_URL: $JITSI_URL
       JITSI_ISS: $JITSI_ISS
+      MAX_PER_GROUP: "$MAX_PER_GROUP"
     volumes:
       - ./back:/usr/src/app
     labels:
diff --git a/docker-compose.yaml b/docker-compose.yaml
index 504c5b23..cea1bc03 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -38,6 +38,8 @@ services:
       TURN_USER: ""
       TURN_PASSWORD: ""
       START_ROOM_URL: "$START_ROOM_URL"
+      MAX_PER_GROUP: "$MAX_PER_GROUP"
+      MAX_USERNAME_LENGTH: "$MAX_USERNAME_LENGTH"
     command: yarn run start
     volumes:
       - ./front:/usr/src/app
@@ -110,6 +112,7 @@ services:
       JITSI_URL: $JITSI_URL
       JITSI_ISS: $JITSI_ISS
       TURN_STATIC_AUTH_SECRET: SomeStaticAuthSecret
+      MAX_PER_GROUP: "MAX_PER_GROUP"
     volumes:
       - ./back:/usr/src/app
     labels:
diff --git a/front/src/Enum/EnvironmentVariable.ts b/front/src/Enum/EnvironmentVariable.ts
index 5040e59f..11479b0f 100644
--- a/front/src/Enum/EnvironmentVariable.ts
+++ b/front/src/Enum/EnvironmentVariable.ts
@@ -15,6 +15,7 @@ const ZOOM_LEVEL = 1/*3/4*/;
 const POSITION_DELAY = 200; // Wait 200ms between sending position events
 const MAX_EXTRAPOLATION_TIME = 100; // Extrapolate a maximum of 250ms if no new movement is sent by the player
 export const MAX_USERNAME_LENGTH = parseInt(process.env.MAX_USERNAME_LENGTH || '') || 8;
+export const MAX_PER_GROUP = parseInt(process.env.MAX_PER_GROUP || '4');
 
 export {
     DEBUG_MODE,
diff --git a/front/src/Phaser/Game/GameScene.ts b/front/src/Phaser/Game/GameScene.ts
index 294174a2..e9028a00 100644
--- a/front/src/Phaser/Game/GameScene.ts
+++ b/front/src/Phaser/Game/GameScene.ts
@@ -10,7 +10,14 @@ import {
     RoomJoinedMessageInterface
 } from "../../Connexion/ConnexionModels";
 import {CurrentGamerInterface, hasMovedEventName, Player} from "../Player/Player";
-import {DEBUG_MODE, JITSI_PRIVATE_MODE, POSITION_DELAY, RESOLUTION, ZOOM_LEVEL} from "../../Enum/EnvironmentVariable";
+import {
+    DEBUG_MODE,
+    JITSI_PRIVATE_MODE,
+    MAX_PER_GROUP,
+    POSITION_DELAY,
+    RESOLUTION,
+    ZOOM_LEVEL
+} from "../../Enum/EnvironmentVariable";
 import {ITiledMap, ITiledMapLayer, ITiledMapLayerProperty, ITiledMapObject, ITiledTileSet} from "../Map/ITiledMap";
 import {AddPlayerInterface} from "./AddPlayerInterface";
 import {PlayerAnimationDirections} from "../Player/Animation";
@@ -1344,7 +1351,7 @@ ${escapedMessage}
             this,
             Math.round(groupPositionMessage.position.x),
             Math.round(groupPositionMessage.position.y),
-            groupPositionMessage.groupSize === 4 ? 'circleSprite-red' : 'circleSprite-white'
+            groupPositionMessage.groupSize === MAX_PER_GROUP ? 'circleSprite-red' : 'circleSprite-white'
         );
         sprite.setDisplayOrigin(48, 48);
         this.add.existing(sprite);