diff --git a/src/3rdparty/harfbuzz-ng/src/hb-coretext.cc b/src/3rdparty/harfbuzz-ng/src/hb-coretext.cc
index ef6798d380..5a34eddecc 100644
--- a/src/3rdparty/harfbuzz-ng/src/hb-coretext.cc
+++ b/src/3rdparty/harfbuzz-ng/src/hb-coretext.cc
@@ -83,7 +83,7 @@ _hb_coretext_shaper_face_data_create (hb_face_t *face)
   if (unlikely (!data))
     return NULL;
 
-  QFontEngine *fe = (QFontEngine *) face->user_data;
+  QFontEngine *fe = (QFontEngine *) ((QFontEngine::FaceData *) face->user_data)->user_data;
   if (fe->type () == QFontEngine::Mac)
   {
     data->cg_font = (CGFontRef) fe->userData ().value<void *> ();
diff --git a/src/gui/text/qharfbuzzng.cpp b/src/gui/text/qharfbuzzng.cpp
index 9f77083102..c09f27b665 100644
--- a/src/gui/text/qharfbuzzng.cpp
+++ b/src/gui/text/qharfbuzzng.cpp
@@ -703,7 +703,11 @@ _hb_qt_font_create(QFontEngine *fe)
     const int x_ppem = (fe->fontDef.pixelSize * fe->fontDef.stretch) / 100;
 
     hb_font_set_funcs(font, hb_qt_get_font_funcs(), (void *)fe, NULL);
+#ifdef Q_OS_MAC
     hb_font_set_scale(font, QFixed(x_ppem).value(), QFixed(y_ppem).value());
+#else
+    hb_font_set_scale(font, QFixed(x_ppem).value(), -QFixed(y_ppem).value());
+#endif
     hb_font_set_ppem(font, x_ppem, y_ppem);
 
     return font;