diff --git a/reactos/base/shell/cmd/internal.c b/reactos/base/shell/cmd/internal.c
index 7d25e24e1a8..a1b201208c9 100644
--- a/reactos/base/shell/cmd/internal.c
+++ b/reactos/base/shell/cmd/internal.c
@@ -768,7 +768,7 @@ INT CommandShowCommandsDetail (LPTSTR cmd, LPTSTR param)
 	{
 		LPTSTR NewCommand = malloc((_tcslen(param)+4)*sizeof(TCHAR));
 		_tcscpy(NewCommand, param);
-		_tcscat(NewCommand, _T(" /?\0"));
+		_tcscat(NewCommand, _T(" /?"));
 		DoCommand(NewCommand);
 		free(NewCommand);
 	}