diff --git a/reactos/dll/win32/setupapi/install.c b/reactos/dll/win32/setupapi/install.c
index 2ddbd63a07e..e0b2d2d5f52 100644
--- a/reactos/dll/win32/setupapi/install.c
+++ b/reactos/dll/win32/setupapi/install.c
@@ -1654,7 +1654,7 @@ static VOID FixupServiceBinaryPath(
                wcslen(L"%SystemRoot%\\") = 13*sizeof(wchar_t) */
             Buffer = MyMalloc(Win32Length);
 
-            wcscpy(Buffer, L"%%SystemRoot%%\\");
+            wcscpy(Buffer, L"%SystemRoot%\\");
             wcscat(Buffer, *ServiceBinary);
             MyFree(*ServiceBinary);