diff --git a/dll/win32/comctl32/button.c b/dll/win32/comctl32/button.c
index bc9336d705e..813aa7455d6 100644
--- a/dll/win32/comctl32/button.c
+++ b/dll/win32/comctl32/button.c
@@ -1273,7 +1273,11 @@ static UINT BUTTON_CalcLabelRect(const BUTTON_INFO *infoPtr, HDC hdc, RECT *rc)
    {
       case DT_TOP:     r.top++;  r.bottom++;  break;
       case DT_VCENTER: n = r.bottom - r.top;
+#ifdef __REACTOS__
+                       r.top    = rc->top + ((rc->bottom - 1 - rc->top) - n) / 2;
+#else
                        r.top    = rc->top + ((rc->bottom - rc->top) - n) / 2;
+#endif
                        r.bottom = r.top + n;  break;
       case DT_BOTTOM:  n = r.bottom - r.top;
                        r.bottom = rc->bottom - 1;
diff --git a/win32ss/user/user32/controls/button.c b/win32ss/user/user32/controls/button.c
index 2538a9847bd..6e7d70e77e0 100644
--- a/win32ss/user/user32/controls/button.c
+++ b/win32ss/user/user32/controls/button.c
@@ -832,7 +832,11 @@ static UINT BUTTON_CalcLabelRect(HWND hwnd, HDC hdc, RECT *rc)
    {
       case DT_TOP:     r.top++;  r.bottom++;  break;
       case DT_VCENTER: n = r.bottom - r.top;
+#ifdef __REACTOS__
+                       r.top    = rc->top + ((rc->bottom - 1 - rc->top) - n) / 2;
+#else
                        r.top    = rc->top + ((rc->bottom - rc->top) - n) / 2;
+#endif
                        r.bottom = r.top + n;  break;
       case DT_BOTTOM:  n = r.bottom - r.top;
                        r.bottom = rc->bottom - 1;