diff --git a/ddraw.def b/ddraw.def
index e453356..01f4f2b 100644
--- a/ddraw.def
+++ b/ddraw.def
@@ -1,6 +1,10 @@
 LIBRARY     ddraw.dll
 
 EXPORTS
+    AcquireDDThreadLock                       @1
+    D3DParseUnknownCommand                    @3
+    DDInternalLock                            @5
+    DDInternalUnlock                          @6
     DirectDrawCreate                          @8
     DirectDrawCreateClipper                   @9
     DirectDrawCreateEx                        @10
@@ -8,5 +12,6 @@ EXPORTS
     DirectDrawEnumerateExA                    @12
     DirectDrawEnumerateExW                    @13
     DirectDrawEnumerateW                      @14
+    ReleaseDDThreadLock                       @21
     GameHandlesClose                          DATA
     pvBmpBits = FakePrimarySurface            DATA
diff --git a/src/dllmain.c b/src/dllmain.c
index cba1465..c575377 100644
--- a/src/dllmain.c
+++ b/src/dllmain.c
@@ -184,3 +184,33 @@ HRESULT WINAPI DirectDrawEnumerateW(LPDDENUMCALLBACKW lpCallback, LPVOID lpConte
     dprintf("<- %s\n", __FUNCTION__);
     return DD_OK;
 }
+
+HRESULT WINAPI D3DParseUnknownCommand(LPVOID lpCmd, LPVOID* lpRetCmd)
+{
+    dprintf("-> %s()\n", __FUNCTION__);
+    return E_FAIL;
+}
+
+DWORD WINAPI AcquireDDThreadLock()
+{
+    dprintf("-> %s()\n", __FUNCTION__);
+    return 0;
+}
+
+DWORD WINAPI ReleaseDDThreadLock()
+{
+    dprintf("-> %s()\n", __FUNCTION__);
+    return 0;
+}
+
+DWORD WINAPI DDInternalLock(DWORD a, DWORD b)
+{
+    dprintf("-> %s()\n", __FUNCTION__);
+    return 0;
+}
+
+DWORD WINAPI DDInternalUnlock(DWORD a)
+{
+    dprintf("-> %s()\n", __FUNCTION__);
+    return 0;
+}