diff --git a/reactos/dll/appcompat/apphelp/layer.c b/reactos/dll/appcompat/apphelp/layer.c
index ab15b2fce31..afe1ca3d5a0 100644
--- a/reactos/dll/appcompat/apphelp/layer.c
+++ b/reactos/dll/appcompat/apphelp/layer.c
@@ -109,7 +109,7 @@ BOOL SdbpIsPathOnRemovableMedia(PCWSTR Path)
 {
     WCHAR tmp[] = { 'A',':','\\',0 };
     ULONG type;
-    if (!Path)
+    if (!Path || Path[0] == UNICODE_NULL)
     {
         SHIM_ERR("Invalid argument\n");
         return FALSE;