diff --git a/_web_server/server/playground-server.scm b/_web_server/server/playground-server.scm
index 5fc411f..d49f2e3 100755
--- a/_web_server/server/playground-server.scm
+++ b/_web_server/server/playground-server.scm
@@ -291,7 +291,7 @@
               (values status compile-log)
 
               ;; Execute
-              (let ((cmdline (format "~a ~a" vvp-exe exe-file)))
+              (let ((cmdline (format "~a -N ~a" vvp-exe exe-file)))
                 (let-values (((status out)
                               (system-to-string cmdline)))
                   (let ((execution-log