diff --git a/reactos/include/wine/setupapi.h b/reactos/include/wine/setupapi.h
index 86337a5fb17..94ada2083d6 100644
--- a/reactos/include/wine/setupapi.h
+++ b/reactos/include/wine/setupapi.h
@@ -675,6 +675,7 @@ LONG     WINAPI AddTagToGroupOrderList(PCWSTR, DWORD, DWORD);
 VOID     WINAPI AssertFail(LPSTR, UINT, LPSTR);
 DWORD    WINAPI CaptureAndConvertAnsiArg(PCSTR lpSrc, PWSTR *lpDst);
 DWORD    WINAPI CaptureStringArg(PCWSTR lpSrc, PWSTR *lpDst);
+VOID     WINAPI CenterWindowRelativeToParent(HWND);
 BOOL     WINAPI ConcatenatePaths(LPWSTR, LPCWSTR, DWORD, LPDWORD);
 BOOL     WINAPI DelayedMove(PCWSTR lpExistingFileName, PCWSTR lpNewFileName);
 BOOL     WINAPI DoesUserHavePrivilege(PCWSTR lpPrivilegeName);
diff --git a/reactos/lib/setupapi/misc.c b/reactos/lib/setupapi/misc.c
index fe9189b8cd6..5ff66c99e19 100644
--- a/reactos/lib/setupapi/misc.c
+++ b/reactos/lib/setupapi/misc.c
@@ -860,7 +860,7 @@ VOID WINAPI AssertFail(LPSTR lpFile, UINT uLine, LPSTR lpMessage)
     CHAR szModule[MAX_PATH];
     CHAR szBuffer[2048];
     LPSTR lpName;
-    LPSTR lpBuffer;
+//    LPSTR lpBuffer;
 
     TRACE("%s %u %s\n", lpFile, uLine, lpMessage);
 
@@ -1044,3 +1044,49 @@ ConcatenatePaths(LPWSTR lpPath,
 
     return (dwBufferSize >= dwTotalSize);
 }
+
+
+/**************************************************************************
+ * CenterWindowRelativeToParent [SETUPAPI.@]
+ *
+ * Centers a window relative to its parent.
+ *
+ * PARAMS
+ *     hwnd [I] Window to center.
+ *
+ * RETURNS
+ *     None
+ */
+VOID WINAPI
+CenterWindowRelativeToParent(HWND hwnd)
+{
+    HWND hwndOwner;
+    POINT ptOrigin;
+    RECT rcWindow;
+    RECT rcOwner;
+    INT nWindowWidth, nWindowHeight;
+    INT nOwnerWidth, nOwnerHeight;
+    INT posX, posY;
+
+    hwndOwner = GetWindow(hwnd, GW_OWNER);
+    if (hwndOwner == NULL)
+        return;
+
+    ptOrigin.x = 0;
+    ptOrigin.y = 0;
+    ClientToScreen(hwndOwner, &ptOrigin);
+
+    GetWindowRect(hwnd, &rcWindow);
+    GetClientRect(hwndOwner, &rcOwner);
+
+    nWindowWidth = rcWindow.right - rcWindow.left;
+    nWindowHeight = rcWindow.bottom - rcWindow.top;
+
+    nOwnerWidth = rcOwner.right - rcOwner.left;
+    nOwnerHeight = rcOwner.bottom - rcOwner.top;
+
+    posX = ((nOwnerWidth - nWindowWidth) / 2) + ptOrigin.x;
+    posY = ((nOwnerHeight - nWindowHeight) / 2) + ptOrigin.y;
+
+    MoveWindow(hwnd, posX, posY, nWindowHeight, nWindowWidth, 0);
+}
diff --git a/reactos/lib/setupapi/setupapi.spec b/reactos/lib/setupapi/setupapi.spec
index 42c19fff93b..bfa968c875e 100644
--- a/reactos/lib/setupapi/setupapi.spec
+++ b/reactos/lib/setupapi/setupapi.spec
@@ -192,7 +192,7 @@
 @ stub CM_Unregister_Device_Interface_ExW
 @ stdcall CaptureAndConvertAnsiArg(str ptr)
 @ stdcall CaptureStringArg(wstr ptr)
-@ stub CenterWindowRelativeToParent
+@ stdcall CenterWindowRelativeToParent(long)
 @ stdcall ConcatenatePaths(wstr wstr long ptr)
 @ stdcall DelayedMove(wstr wstr)
 @ stub DelimStringToMultiSz
diff --git a/reactos/w32api/include/setupapi.h b/reactos/w32api/include/setupapi.h
index 97bea01d3f3..8792b69460d 100644
--- a/reactos/w32api/include/setupapi.h
+++ b/reactos/w32api/include/setupapi.h
@@ -1038,6 +1038,7 @@ typedef SP_BACKUP_QUEUE_PARAMS_A SP_BACKUP_QUEUE_PARAMS,
 
 
 WINSETUPAPI LONG WINAPI AddTagToGroupOrderList(PCWSTR, DWORD, DWORD);
+WINSETUPAPI VOID WINAPI CenterWindowRelativeToParent(HWND);
 WINSETUPAPI PWSTR WINAPI DuplicateString(PCWSTR);
 WINSETUPAPI BOOL WINAPI IsUserAdmin(VOID);
 WINSETUPAPI VOID WINAPI MyFree(PVOID);