diff --git a/modules/rostests/apitests/user32/CMakeLists.txt b/modules/rostests/apitests/user32/CMakeLists.txt
index 24a6921472b..302a084934e 100644
--- a/modules/rostests/apitests/user32/CMakeLists.txt
+++ b/modules/rostests/apitests/user32/CMakeLists.txt
@@ -8,6 +8,7 @@ list(APPEND SOURCE
     CreateWindowEx.c
     DeferWindowPos.c
     DestroyCursorIcon.c
+    DM_REPOSITION.c
     DrawIconEx.c
     desktop.c
     EmptyClipboard.c
diff --git a/modules/rostests/apitests/user32/DM_REPOSITION.c b/modules/rostests/apitests/user32/DM_REPOSITION.c
new file mode 100644
index 00000000000..70d7c9e7632
--- /dev/null
+++ b/modules/rostests/apitests/user32/DM_REPOSITION.c
@@ -0,0 +1,98 @@
+/*
+ * PROJECT:     ReactOS API tests
+ * LICENSE:     LGPL-2.1+ (https://spdx.org/licenses/LGPL-2.1+)
+ * PURPOSE:     Test for DM_REPOSITION
+ * COPYRIGHT:   Copyright 2019 Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
+ */
+
+#include "precomp.h"
+#include <windowsx.h>
+
+static BOOL OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam)
+{
+    RECT rc, rcWork;
+    INT cx, cy;
+    HMONITOR hMon;
+    MONITORINFO mi = { sizeof(mi) };
+
+    /* get monitor info */
+    hMon = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
+    ok(hMon != NULL, "hMon is NULL\n");
+    ok_int(GetMonitorInfoW(hMon, &mi), TRUE);
+    rcWork = mi.rcWork;
+
+    /* get size */
+    GetWindowRect(hwnd, &rc);
+    cx = rc.right - rc.left;
+    cy = rc.bottom - rc.top;
+
+    /* move */
+    ok_int(SetWindowPos(hwnd, NULL, rcWork.left - 80, rcWork.top - 80, 0, 0,
+                        SWP_NOACTIVATE | SWP_NOSIZE | SWP_NOOWNERZORDER |
+                        SWP_NOZORDER), TRUE);
+    ok_int(GetWindowRect(hwnd, &rc), TRUE);
+    ok_long(rc.left, rcWork.left - 80);
+    ok_long(rc.top, rcWork.top - 80);
+    ok_long(rc.right, rc.left + cx);
+    ok_long(rc.bottom, rc.top + cy);
+
+    /* reposition */
+    ok_int(SendMessageW(hwnd, DM_REPOSITION, 0, 0), 0);
+    ok_int(GetWindowRect(hwnd, &rc), TRUE);
+    ok_long(rc.left, rcWork.left);
+    ok_long(rc.top, rcWork.top);
+    ok_long(rc.right, rc.left + cx);
+    ok_long(rc.bottom, rc.top + cy);
+
+    /* move */
+    ok_int(SetWindowPos(hwnd, NULL,
+                        rcWork.right - cx + 80, rcWork.bottom - cy + 80, 0, 0,
+                        SWP_NOACTIVATE | SWP_NOSIZE | SWP_NOOWNERZORDER |
+                        SWP_NOZORDER), TRUE);
+    ok_int(GetWindowRect(hwnd, &rc), TRUE);
+    ok_long(rc.left, rcWork.right - cx + 80);
+    ok_long(rc.top, rcWork.bottom - cy + 80);
+    ok_long(rc.right, rc.left + cx);
+    ok_long(rc.bottom, rc.top + cy);
+
+    /* reposition */
+    ok_int(SendMessageW(hwnd, DM_REPOSITION, 0, 0), 0);
+    ok_int(GetWindowRect(hwnd, &rc), TRUE);
+    ok_long(rc.left, rcWork.right - cx);
+    ok_long(rc.top, rcWork.bottom - cy - 4);
+    ok_long(rc.right, rc.left + cx);
+    ok_long(rc.bottom, rc.top + cy);
+
+    /* quit */
+    PostMessage(hwnd, WM_COMMAND, IDOK, 0);
+    return TRUE;
+}
+
+static void OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify)
+{
+    switch (id)
+    {
+        case IDOK:
+        case IDCANCEL:
+            EndDialog(hwnd, id);
+            break;
+    }
+}
+
+static INT_PTR CALLBACK
+DialogProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+    switch (uMsg)
+    {
+        HANDLE_MSG(hwnd, WM_INITDIALOG, OnInitDialog);
+        HANDLE_MSG(hwnd, WM_COMMAND, OnCommand);
+    }
+    return 0;
+}
+
+START_TEST(DM_REPOSITION)
+{
+    HMODULE hMod = GetModuleHandle(NULL);
+    ok(hMod != NULL, "\n");
+    DialogBox(hMod, TEXT("REPOSITION"), NULL, DialogProc);
+}
diff --git a/modules/rostests/apitests/user32/testlist.c b/modules/rostests/apitests/user32/testlist.c
index 0118bf23b69..5803f028e69 100644
--- a/modules/rostests/apitests/user32/testlist.c
+++ b/modules/rostests/apitests/user32/testlist.c
@@ -10,6 +10,7 @@ extern void func_CreateIconFromResourceEx(void);
 extern void func_CreateWindowEx(void);
 extern void func_DeferWindowPos(void);
 extern void func_DestroyCursorIcon(void);
+extern void func_DM_REPOSITION(void);
 extern void func_DrawIconEx(void);
 extern void func_desktop(void);
 extern void func_EmptyClipboard(void);
@@ -57,6 +58,7 @@ const struct test winetest_testlist[] =
     { "CreateWindowEx", func_CreateWindowEx },
     { "DeferWindowPos", func_DeferWindowPos },
     { "DestroyCursorIcon", func_DestroyCursorIcon },
+    { "DM_REPOSITION", func_DM_REPOSITION },
     { "DrawIconEx", func_DrawIconEx },
     { "desktop", func_desktop },
     { "EmptyClipboard", func_EmptyClipboard },
diff --git a/modules/rostests/apitests/user32/user32_apitest.rc b/modules/rostests/apitests/user32/user32_apitest.rc
index 85b88e08da5..8f56c8c8647 100644
--- a/modules/rostests/apitests/user32/user32_apitest.rc
+++ b/modules/rostests/apitests/user32/user32_apitest.rc
@@ -31,3 +31,10 @@ FONT 8, "MS Shell Dlg"
     CONTROL "OK", IDOK, "BUTTON", BS_DEFPUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, 65, 98, 60, 14
     CONTROL "Cancel", IDCANCEL, "BUTTON", BS_PUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP, 187, 100, 60, 14
 }
+
+REPOSITION DIALOG 0, 0, 200, 150
+STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
+CAPTION "DM_REPOSITION"
+FONT 8, "MS Shell Dlg"
+{
+}