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-rw-r--r--win32/PlatWin.cxx2
1 files changed, 1 insertions, 1 deletions
diff --git a/win32/PlatWin.cxx b/win32/PlatWin.cxx
index d449e78a9..6f0c6553b 100644
--- a/win32/PlatWin.cxx
+++ b/win32/PlatWin.cxx
@@ -1361,7 +1361,7 @@ void SurfaceD2D::AlphaRectangle(PRectangle rc, int cornerSize, ColourDesired fil
const float cornerSizeF = static_cast<float>(cornerSize);
D2D1_ROUNDED_RECT roundedRectFill = {
D2D1::RectF(std::round(rc.left) + 1.0f, rc.top + 1.0f, std::round(rc.right) - 1.0f, rc.bottom - 1.0f),
- cornerSizeF, cornerSizeF};
+ cornerSizeF - 1.0f, cornerSizeF - 1.0f };
D2DPenColour(fill, alphaFill);
pRenderTarget->FillRoundedRectangle(roundedRectFill, pBrush);