diff --git a/dlls/user/user32.spec b/dlls/user/user32.spec
index 2df366fd84d..d0ec2097dcb 100644
--- a/dlls/user/user32.spec
+++ b/dlls/user/user32.spec
@@ -651,15 +651,17 @@ debug_channels (accel caret class clipboard combo cursor dc ddeml dialog driver
 @ stdcall RegisterDeviceNotificationA(long ptr long) RegisterDeviceNotificationA
 @ stub    RegisterDeviceNotificationW
 @ stub    UnregisterDeviceNotification
+
 # win98/win2k
-@ stdcall GetClipboardSequenceNumber () GetClipboardSequenceNumber
 @ stdcall AllowSetForegroundWindow (long) AllowSetForegroundWindow
-@ stdcall LockSetForegroundWindow (long) LockSetForegroundWindow
+@ stdcall AnimateWindow(long long long) AnimateWindow
 @ stdcall DrawMenuBarTemp(long long) DrawMenuBarTemp
 @ stdcall EnumDisplaySettingsExA(str long ptr long) EnumDisplaySettingsExA
 @ stdcall EnumDisplaySettingsExW(wstr long ptr long) EnumDisplaySettingsExW
+@ stdcall GetClipboardSequenceNumber () GetClipboardSequenceNumber
 @ stdcall GetWindowModuleFileNameA(long ptr long) GetWindowModuleFileNameA
 @ stdcall GetWindowModuleFileNameW(long ptr long) GetWindowModuleFileNameW
+@ stdcall LockSetForegroundWindow (long) LockSetForegroundWindow
 
 ################################################################
 # Wine extensions: Win16 functions that are needed by other dlls
diff --git a/include/winuser.h b/include/winuser.h
index 56c45073eab..c7a96d51917 100644
--- a/include/winuser.h
+++ b/include/winuser.h
@@ -2525,6 +2525,17 @@ DECL_WINELIB_TYPE_AW(LPICONMETRICS)
 #define PM_REMOVE	0x0001
 #define PM_NOYIELD	0x0002
 
+/* AnimateWindow() flags */
+#define AW_SLIDE        0x00040000
+#define AW_ACTIVATE     0x00020000
+#define AW_BLEND        0x00080000
+#define AW_HIDE         0x00010000
+#define AW_CENTER       0x00000010
+#define AW_HOR_POSITIVE 0x00000001
+#define AW_HOR_NEGATIVE 0x00000002
+#define AW_VER_POSITIVE 0x00000004
+#define AW_VER_NEGATIVE 0x00000008
+
 /* WM_SHOWWINDOW wParam codes */
 #define SW_PARENTCLOSING    1
 #define SW_OTHERMAXIMIZED   2
@@ -3247,8 +3258,9 @@ BOOL        WINAPI SetKeyboardState(LPBYTE);
 
 /* Declarations for functions that change between Win16 and Win32 */
 
-BOOL      WINAPI AdjustWindowRect(LPRECT,DWORD,BOOL);
-BOOL      WINAPI AdjustWindowRectEx(LPRECT,DWORD,BOOL,DWORD);
+BOOL        WINAPI AdjustWindowRect(LPRECT,DWORD,BOOL);
+BOOL        WINAPI AdjustWindowRectEx(LPRECT,DWORD,BOOL,DWORD);
+BOOL        WINAPI AnimateWindow(HWND,DWORD,DWORD);
 #define     AnsiLowerA CharLowerA
 #define     AnsiLowerW CharLowerW
 #define     AnsiLower WINELIB_NAME_AW(AnsiLower)
diff --git a/windows/winpos.c b/windows/winpos.c
index 42e87c309c5..afcf9cc0bdc 100644
--- a/windows/winpos.c
+++ b/windows/winpos.c
@@ -1393,6 +1393,30 @@ void WINAPI SetInternalWindowPos16( HWND16 hwnd, UINT16 showCmd,
     }
 }
 
+/***********************************************************************
+ *		AnimateWindow (USER32.@)
+ *		Shows/Hides a window with an animation
+ *		NO ANIMATION YET
+ */
+BOOL WINAPI AnimateWindow(HWND hwnd, DWORD dwTime, DWORD dwFlags)
+{
+	FIXME("partial stub\n");
+
+	/* If trying to show/hide and it's already   *
+	 * shown/hidden or invalid window, fail with *
+	 * invalid parameter                         */
+	if(!IsWindow(hwnd) ||
+	   (IsWindowVisible(hwnd) && !(dwFlags & AW_HIDE)) ||
+	   (!IsWindowVisible(hwnd) && (dwFlags & AW_HIDE)))
+	{
+		SetLastError(ERROR_INVALID_PARAMETER);
+		return FALSE;
+	}
+
+	ShowWindow(hwnd, (dwFlags & AW_HIDE) ? SW_HIDE : ((dwFlags & AW_ACTIVATE) ? SW_SHOW : SW_SHOWNA));
+
+	return TRUE;
+}
 
 /***********************************************************************
  *		SetInternalWindowPos (USER32.@)