diff --git a/harbour/source/debug/debugger.prg b/harbour/source/debug/debugger.prg
index 5f70d00f76..f2432cc394 100644
--- a/harbour/source/debug/debugger.prg
+++ b/harbour/source/debug/debugger.prg
@@ -883,7 +883,7 @@ METHOD OSShell() CLASS TDebugger
 
    begin sequence
       if At("WINDOWS", cOs) != 0 .OR. At("DOS", cOs) != 0 .OR. At("OS/2", cOs) != 0
-         RUN cShell
+         RUN ( cShell )
 
       else
          Alert( "Not implemented yet!" )