diff --git a/core/fxge/dib/cfx_imagetransformer.cpp b/core/fxge/dib/cfx_imagetransformer.cpp
index 8e01127b0..f4ce4d915 100644
--- a/core/fxge/dib/cfx_imagetransformer.cpp
+++ b/core/fxge/dib/cfx_imagetransformer.cpp
@@ -315,14 +315,14 @@ bool CFX_ImageTransformer::Continue(IFX_PauseIndicator* pPause) {
   } else if (pDestMask) {
     CalcData cdata = {
         pDestMask.Get(), result2stretch, pSrcMaskBuf,
-        m_Storer.GetBitmap()->m_pAlphaMask->GetPitch(),
+        static_cast<uint32_t>(m_Storer.GetBitmap()->m_pAlphaMask->GetPitch()),
     };
     CalcMask(cdata);
   }
 
   CalcData cdata = {pTransformed.Get(), result2stretch,
                     m_Storer.GetBitmap()->GetBuffer(),
-                    m_Storer.GetBitmap()->GetPitch()};
+                    static_cast<uint32_t>(m_Storer.GetBitmap()->GetPitch())};
   if (m_Storer.GetBitmap()->IsAlphaMask()) {
     CalcAlpha(cdata);
   } else {