diff --git a/reactos/dll/cpl/mmsys/mmsys.c b/reactos/dll/cpl/mmsys/mmsys.c
index d9a5c5124f9..53d962b23d7 100644
--- a/reactos/dll/cpl/mmsys/mmsys.c
+++ b/reactos/dll/cpl/mmsys/mmsys.c
@@ -67,14 +67,15 @@ HardwareDlgProc(HWND hwndDlg,
 	        WPARAM wParam,
 	        LPARAM lParam)
 {
+    UNREFERENCED_PARAMETER(lParam);
+    UNREFERENCED_PARAMETER(wParam);
     switch(uMsg)
     {
         case WM_INITDIALOG:
         {
-            GUID Guids[] = {
-                GUID_DEVCLASS_CDROM,
-                GUID_DEVCLASS_MEDIA,
-            };
+            GUID Guids[2];
+            Guids[0] = GUID_DEVCLASS_CDROM;
+            Guids[1] = GUID_DEVCLASS_MEDIA;
 
             /* create the hardware page */
             DeviceCreateHardwarePageEx(hwndDlg,
@@ -98,6 +99,11 @@ MmSysApplet(HWND hwnd,
     PROPSHEETHEADER psh = {0};
     TCHAR Caption[256];
 
+    UNREFERENCED_PARAMETER(lParam);
+    UNREFERENCED_PARAMETER(wParam);
+    UNREFERENCED_PARAMETER(uMsg);
+    UNREFERENCED_PARAMETER(hwnd);
+
     LoadString(hApplet,
                IDS_CPLNAME,
                Caption,
@@ -182,6 +188,7 @@ DllMain(HINSTANCE hinstDLL,
 	DWORD dwReason,
 	LPVOID lpReserved)
 {
+    UNREFERENCED_PARAMETER(lpReserved);
     switch(dwReason)
     {
         case DLL_PROCESS_ATTACH: