diff --git a/reactos/lib/winmm/mci.c b/reactos/lib/winmm/mci.c
index 728d38d8081..5faa40da09d 100644
--- a/reactos/lib/winmm/mci.c
+++ b/reactos/lib/winmm/mci.c
@@ -456,15 +456,15 @@ static DWORD MCI_UnmapMsgAtoW(UINT msg, DWORD_PTR dwParam1, DWORD_PTR dwParam2,
             if (dwParam1 & MCI_OPEN_TYPE)
             {
                 if (!(dwParam1 & MCI_OPEN_TYPE_ID))
-                    HeapFree(GetProcessHeap(), 0, mci_openW->lpstrDeviceType);
+                    HeapFree(GetProcessHeap(), 0, (PVOID)mci_openW->lpstrDeviceType);
             }
             if (dwParam1 & MCI_OPEN_ELEMENT)
             {
                 if (!(dwParam1 & MCI_OPEN_ELEMENT_ID))
-                    HeapFree(GetProcessHeap(), 0, mci_openW->lpstrElementName);
+                    HeapFree(GetProcessHeap(), 0, (PVOID)mci_openW->lpstrElementName);
             }
             if (dwParam1 & MCI_OPEN_ALIAS)
-                HeapFree(GetProcessHeap(), 0, mci_openW->lpstrAlias);
+                HeapFree(GetProcessHeap(), 0, (PVOID)mci_openW->lpstrAlias);
             HeapFree(GetProcessHeap(), 0, ptr);
         }
         break;
diff --git a/reactos/lib/winmm/winmm.c b/reactos/lib/winmm/winmm.c
index 45f5307aeed..ed5614e6ba1 100644
--- a/reactos/lib/winmm/winmm.c
+++ b/reactos/lib/winmm/winmm.c
@@ -103,8 +103,10 @@ static	void WINMM_DeleteIData(void)
  *             WINMM_LoadMMSystem
  *
  */
+#ifndef __REACTOS__
 static HANDLE (WINAPI *pGetModuleHandle16)(LPCSTR);
 static DWORD (WINAPI *pLoadLibrary16)(LPCSTR);
+#endif
 
 BOOL WINMM_CheckForMMSystem(void)
 {