diff --git a/RestControllers/friendsController.php b/RestControllers/friendsController.php
index 90b4506..801b4d3 100644
--- a/RestControllers/friendsController.php
+++ b/RestControllers/friendsController.php
@@ -38,7 +38,7 @@ class friendsController{
 		}
 
 		//Update the last activity of the user
-		CS::get()->components->user->updateLastActivity(userID);
+		update_last_user_activity_if_allowed();
 
 		//Return list
 		return $api_list;
diff --git a/RestControllers/userController.php b/RestControllers/userController.php
index fdb6669..b52f84e 100644
--- a/RestControllers/userController.php
+++ b/RestControllers/userController.php
@@ -129,7 +129,7 @@ class userController
 		user_login_required();
 
 		//Update last user activity
-		CS::get()->components->user->updateLastActivity(userID);
+		update_last_user_activity_if_allowed();
 
 		//Return userID
 		return array("userID" => userID);
diff --git a/functions/user.php b/functions/user.php
index da9c4bc..740166d 100644
--- a/functions/user.php
+++ b/functions/user.php
@@ -58,4 +58,21 @@ function check_post_password(int $userID, string $name) : bool {
     
     //Else the password seems to be valid
     return TRUE;
+}
+
+/**
+ * Update last user activity if the user allows it
+ * 
+ * This function do not do anything if the incognito mode
+ * has been enabled by the user
+ */
+function update_last_user_activity_if_allowed() {
+
+    //Check if incognito mode is enabled
+    if(isset($_POST["incognito"]))
+        return;
+    
+    //Update last activity time of the user
+    CS::get()->components->user->updateLastActivity(userID);
+
 }
\ No newline at end of file