diff --git a/samples/widgets/widgets.cpp b/samples/widgets/widgets.cpp
index a020aa501c..f19d1dbd95 100644
--- a/samples/widgets/widgets.cpp
+++ b/samples/widgets/widgets.cpp
@@ -744,7 +744,7 @@ void WidgetsFrame::InitBook()
 
     wxTreeItemIdValue cookie;
     tree->EnsureVisible(tree->GetFirstChild(tree->GetRootItem(), cookie));
-    tree->SetMinSize(wxSize(tree->GetBestSize().GetWidth() * 1.1, wxDefaultCoord));
+    tree->SetMinSize(wxSize(tree->GetBestSize().GetWidth() * 9 / 8, wxDefaultCoord));
 #else
     if ( !pageSet || !m_book->GetCurrentPage() )
     {
diff --git a/src/gtk/webview_webkit2.cpp b/src/gtk/webview_webkit2.cpp
index 4b082f294e..06fe094b30 100644
--- a/src/gtk/webview_webkit2.cpp
+++ b/src/gtk/webview_webkit2.cpp
@@ -1021,7 +1021,7 @@ void wxWebViewWebKit::SetWebkitZoom(float level)
 
 float wxWebViewWebKit::GetWebkitZoom() const
 {
-    return webkit_web_view_get_zoom_level(m_web_view);
+    return float(webkit_web_view_get_zoom_level(m_web_view));
 }
 
 void wxWebViewWebKit::EnableAccessToDevTools(bool enable)
diff --git a/src/qt/dc.cpp b/src/qt/dc.cpp
index 712d5dc19c..605e1f304f 100644
--- a/src/qt/dc.cpp
+++ b/src/qt/dc.cpp
@@ -212,7 +212,7 @@ wxSize wxQtDCImpl::GetPPI() const
     if (!srn)
         return wxSize(m_qtPainter->device()->logicalDpiX(), m_qtPainter->device()->logicalDpiY());
     qreal dotsPerInch = srn->logicalDotsPerInch();
-    return wxSize(round(dotsPerInch), round(dotsPerInch));
+    return wxSize(std::lround(dotsPerInch), std::lround(dotsPerInch));
 }
 
 void wxQtDCImpl::SetFont(const wxFont& font)
diff --git a/src/qt/graphics.cpp b/src/qt/graphics.cpp
index 3ef5688f47..597e5aa3a9 100644
--- a/src/qt/graphics.cpp
+++ b/src/qt/graphics.cpp
@@ -1562,12 +1562,14 @@ wxQtGraphicsRenderer::CreateSubBitmap(const wxGraphicsBitmap& bitmap,
     const int srcHeight = sourcePixmap.height();
     const int dstWidth = wxRound(w);
     const int dstHeight = wxRound(h);
+    const int dstX = wxRound(x);
+    const int dstY = wxRound(y);
 
-    wxCHECK_MSG(x >= 0.0 && y >= 0.0 && dstWidth > 0 && dstHeight > 0 &&
-            x + dstWidth <= srcWidth && y + dstHeight <= srcHeight,
+    wxCHECK_MSG(dstX >= 0 && dstY >= 0 && dstWidth > 0 && dstHeight > 0 &&
+            dstX + dstWidth <= srcWidth && dstY + dstHeight <= srcHeight,
             wxNullGraphicsBitmap, wxS("Invalid bitmap region"));
 
-    QPixmap subPixmap = sourcePixmap.copy(x, y, w, h);
+    QPixmap subPixmap = sourcePixmap.copy(dstX, dstY, dstWidth, dstHeight);
 
     wxGraphicsBitmap bmpRes;
     bmpRes.SetRefData(new wxQtBitmapData(this, subPixmap));