diff --git a/src/fsh.nim b/src/fsh.nim
index a2906eb..51fd803 100644
--- a/src/fsh.nim
+++ b/src/fsh.nim
@@ -311,16 +311,16 @@ proc runBuiltin(builtin: string, args: openArray[string]): (string, int) =
     of "cd":
       try:
         if args.len == 0:
-          shellVariables[shellVariables.high]["LASTPWD"] = getCurrentDir()
+          shellVariables[0]["LASTPWD"] = getCurrentDir()
           setCurrentDir(getHomeDir())
           return ("", 0)
         else:
           if args[0] == "-":
             let LASTPWD = getCurrentDir()
-            setCurrentDir(shellVariables[shellVariables.high]["LASTPWD"])
-            shellVariables[shellVariables.high]["LASTPWD"] = LASTPWD
+            setCurrentDir(shellVariables[0]["LASTPWD"])
+            shellVariables[0]["LASTPWD"] = LASTPWD
             return ("", 0)
-          shellVariables[shellVariables.high]["LASTPWD"] = getCurrentDir()
+          shellVariables[0]["LASTPWD"] = getCurrentDir()
           setCurrentDir(args[0])
           return ("", 0)
       except OsError as e:
@@ -375,12 +375,12 @@ when isMainModule:
   setControlCHook(ctrlc)
   let stdinstrm = stdin.newFileStream
   # Set the default prompt
-  shellVariables[shellVariables.high]["PROMPT"] = "$PWD \\$"
-  stdout.write(shellVariables[shellVariables.high]["PROMPT"].newStringStream.substitute)
+  shellVariables[0]["PROMPT"] = "$PWD \\$"
+  stdout.write(shellVariables[0]["PROMPT"].newStringStream.substitute)
   while not stdinstrm.atEnd():
     try:
       discard stdinstrm.readCommand.execute
-      stdout.write(shellVariables[shellVariables.high]["PROMPT"].newStringStream.substitute)
+      stdout.write(shellVariables[0]["PROMPT"].newStringStream.substitute)
     except ShellError, ShellCommandError, ShellVariableError:
       let e = getCurrentException()
       stderr.write(e.msg, "\n")