diff --git a/src/ScriptEditor/NetscriptDefinitions.d.ts b/src/ScriptEditor/NetscriptDefinitions.d.ts
index d125e2c8e..4ea848098 100644
--- a/src/ScriptEditor/NetscriptDefinitions.d.ts
+++ b/src/ScriptEditor/NetscriptDefinitions.d.ts
@@ -4690,11 +4690,12 @@ export interface NS extends Singularity {
    * Kills all running scripts on the specified server. This function returns true
    * if any scripts were killed, and false otherwise. In other words, it will return
    * true if there are any scripts running on the target server.
+   * If no host is defined, it will kill all scripts, where the script is running.
    *
    * @param host - IP or hostname of the server on which to kill all scripts.
    * @returns True if any scripts were killed, and false otherwise.
    */
-  killall(host: string): boolean;
+  killall(host?: string): boolean;
 
   /**
    * Terminates the current script immediately.