diff --git a/lcl/interfaces/qt5/qtwinapi.inc b/lcl/interfaces/qt5/qtwinapi.inc
index 4f401e474d..1b90827302 100644
--- a/lcl/interfaces/qt5/qtwinapi.inc
+++ b/lcl/interfaces/qt5/qtwinapi.inc
@@ -4810,10 +4810,18 @@ begin
       QtFont := QWidget_font(AMenu);
       QFont_family(QtFont, @AName);
       Font.Name := UTF16ToUTF8(AName);
+      {$ifdef darwin}
+      // issue #34625
+      if QFont_pointSize(QtFont) > 0 then
+        Font.Height := -Round(QFont_pointSizeF(QtFont))
+      else
+        Font.Height := QFont_pixelSize(QtFont);
+      {$else}
       if QFont_pointSize(QtFont) > 0 then
         Font.Size := QFont_pointSize(QtFont)
       else
         Font.Height := QFont_pixelSize(QtFont);
+      {$endif}
       if QFont_bold(QtFont) then
         Font.Style := Font.Style + [fsBold];
       if QFont_italic(QtFont) then
@@ -4837,10 +4845,18 @@ begin
         QApplication_font(QtFont);
       QFont_family(QtFont, @AName);
       Font.Name := UTF16ToUTF8(AName);
+      {$ifdef darwin}
+      // issue #34625
+      if QFont_pointSize(QtFont) > 0 then
+        Font.Height := -Round(QFont_pointSizeF(QtFont))
+      else
+        Font.Height := QFont_pixelSize(QtFont);
+      {$else}
       if QFont_pointSize(QtFont) > 0 then
         Font.Size := QFont_pointSize(QtFont)
       else
         Font.Height := QFont_pixelSize(QtFont);
+      {$endif}
       if QFont_bold(QtFont) then
         Font.Style := Font.Style + [fsBold];
       if QFont_italic(QtFont) then