diff --git a/dll/win32/mmdevapi/audiovolume.c b/dll/win32/mmdevapi/audiovolume.c
index 76f9f4ec1e5..24d210a1c85 100644
--- a/dll/win32/mmdevapi/audiovolume.c
+++ b/dll/win32/mmdevapi/audiovolume.c
@@ -17,7 +17,6 @@
  */
 
 #define COBJMACROS
-#include "config.h"
 
 #include <stdarg.h>
 
@@ -26,7 +25,6 @@
 #include "winnls.h"
 #include "winreg.h"
 #include "wine/debug.h"
-#include "wine/unicode.h"
 
 #include "ole2.h"
 #include "mmdeviceapi.h"
diff --git a/dll/win32/mmdevapi/devenum.c b/dll/win32/mmdevapi/devenum.c
index 685ec27de62..82e1bb96c2a 100644
--- a/dll/win32/mmdevapi/devenum.c
+++ b/dll/win32/mmdevapi/devenum.c
@@ -16,8 +16,6 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#include "config.h"
-
 #include <stdarg.h>
 
 #define NONAMELESSUNION
@@ -28,7 +26,6 @@
 #include "winreg.h"
 #include "wine/debug.h"
 #include "wine/list.h"
-#include "wine/unicode.h"
 
 #include "initguid.h"
 #include "ole2.h"
@@ -448,7 +445,7 @@ static HRESULT load_devices_from_reg(void)
             && SUCCEEDED(MMDevice_GetPropValue(&guid, curflow, (const PROPERTYKEY*)&DEVPKEY_Device_FriendlyName, &pv))
             && pv.vt == VT_LPWSTR)
         {
-            DWORD size_bytes = (strlenW(pv.u.pwszVal) + 1) * sizeof(WCHAR);
+            DWORD size_bytes = (lstrlenW(pv.u.pwszVal) + 1) * sizeof(WCHAR);
             WCHAR *name = HeapAlloc(GetProcessHeap(), 0, size_bytes);
             memcpy(name, pv.u.pwszVal, size_bytes);
             MMDevice_Create(name, &guid, curflow,
@@ -1431,7 +1428,7 @@ static HRESULT WINAPI MMDevPropStore_GetAt(IPropertyStore *iface, DWORD prop, PR
     RegCloseKey(propkey);
     buffer[38] = 0;
     CLSIDFromString(buffer, &key->fmtid);
-    key->pid = atoiW(&buffer[39]);
+    key->pid = wcstol(&buffer[39], NULL, 10);
     return S_OK;
 }
 
diff --git a/dll/win32/mmdevapi/main.c b/dll/win32/mmdevapi/main.c
index 8886975c96a..7680b451381 100644
--- a/dll/win32/mmdevapi/main.c
+++ b/dll/win32/mmdevapi/main.c
@@ -17,16 +17,12 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#include "config.h"
-#include "wine/port.h"
-
 #include <stdarg.h>
 
 #define COBJMACROS
 #include "windef.h"
 #include "winbase.h"
 #include "wingdi.h"
-#include "wine/library.h"
 
 #include "ole2.h"
 #include "olectl.h"
@@ -44,7 +40,6 @@
 
 #include "mmdevapi.h"
 #include "wine/debug.h"
-#include "wine/unicode.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(mmdevapi);
 
@@ -139,7 +134,7 @@ static BOOL WINAPI init_driver(INIT_ONCE *once, void *param, void **context)
 
     TRACE("Loading driver list %s\n", wine_dbgstr_w(driver_list));
     for(next = p = driver_list; next; p = next + 1){
-        next = strchrW(p, ',');
+        next = wcschr(p, ',');
         if(next)
             *next = '\0';
 
diff --git a/dll/win32/mmdevapi/mmdevapi.h b/dll/win32/mmdevapi/mmdevapi.h
index ecf44c6e9f6..18971893d22 100644
--- a/dll/win32/mmdevapi/mmdevapi.h
+++ b/dll/win32/mmdevapi/mmdevapi.h
@@ -18,10 +18,6 @@
 
 #pragma once
 
-#ifndef __WINE_CONFIG_H
-# error You must include config.h to use this header
-#endif
-
 extern HRESULT MMDevEnum_Create(REFIID riid, void **ppv) DECLSPEC_HIDDEN;
 extern void MMDevEnum_Free(void) DECLSPEC_HIDDEN;
 
diff --git a/dll/win32/mmdevapi/precomp.h b/dll/win32/mmdevapi/precomp.h
index 9d554feba06..17fb891552b 100644
--- a/dll/win32/mmdevapi/precomp.h
+++ b/dll/win32/mmdevapi/precomp.h
@@ -2,9 +2,6 @@
 #ifndef _MMDEVAPI_PRECOMP_H_
 #define _MMDEVAPI_PRECOMP_H_
 
-#include <wine/config.h>
-#include <wine/port.h>
-
 #include <stdarg.h>
 
 #define WIN32_NO_STATUS
@@ -18,13 +15,13 @@
 #include <winbase.h>
 #include <wingdi.h>
 #include <winreg.h>
+#include <winnls.h>
 #include <objbase.h>
 #include <audiopolicy.h>
 #include <endpointvolume.h>
 #include <mmdeviceapi.h>
 
 #include <wine/debug.h>
-#include <wine/unicode.h>
 
 #include "mmdevapi.h"
 
diff --git a/media/doc/README.WINE b/media/doc/README.WINE
index 52895acaf07..6155fe247c6 100644
--- a/media/doc/README.WINE
+++ b/media/doc/README.WINE
@@ -98,7 +98,7 @@ dll/win32/mciseq              # Synced to WineStaging-4.18
 dll/win32/mciwave             # Synced to WineStaging-4.18
 dll/win32/mgmtapi             # Synced to WineStaging-3.3
 dll/win32/mlang               # Synced to WineStaging-4.18
-dll/win32/mmdevapi            # Synced to WineStaging-4.0
+dll/win32/mmdevapi            # Synced to WineStaging-4.18
 dll/win32/mpr                 # Synced to WineStaging-3.17
 dll/win32/mprapi              # Synced to WineStaging-3.3
 dll/win32/msacm32             # Synced to WineStaging-4.0