diff --git a/scripts/runfvp b/scripts/runfvp
index 0ebf873e..7a3c239a 100755
--- a/scripts/runfvp
+++ b/scripts/runfvp
@@ -270,7 +270,12 @@ if __name__ == "__main__":
     try:
         # Set the process group so that it's possible to kill runfvp and
         # everything it spawns easily.
-        os.setpgid(0, 0)
+        # Ignore permission errors happening when spawned from an other process
+        # for example run from except
+        try:
+            os.setpgid(0, 0)
+        except PermissionError:
+            pass
         if sys.stdin.isatty():
             signal.signal(signal.SIGTTOU, signal.SIG_IGN)
             os.tcsetpgrp(sys.stdin.fileno(), os.getpgrp())