diff --git a/src/gui/text/qharfbuzzng.cpp b/src/gui/text/qharfbuzzng.cpp
index 08072b1cf3..b4ab5856df 100644
--- a/src/gui/text/qharfbuzzng.cpp
+++ b/src/gui/text/qharfbuzzng.cpp
@@ -581,7 +581,7 @@ static hb_user_data_key_t _useDesignMetricsKey;
 
 void hb_qt_font_set_use_design_metrics(hb_font_t *font, uint value)
 {
-    hb_font_set_user_data(font, &_useDesignMetricsKey, (void *)value, NULL, true);
+    hb_font_set_user_data(font, &_useDesignMetricsKey, (void *)quintptr(value), NULL, true);
 }
 
 uint hb_qt_font_get_use_design_metrics(hb_font_t *font)
diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp
index 08b0491ddc..a1206ab3d5 100644
--- a/src/gui/text/qtextengine.cpp
+++ b/src/gui/text/qtextengine.cpp
@@ -1124,7 +1124,7 @@ int QTextEngine::shapeTextWithHarfbuzzNG(const QScriptItem &si, const ushort *st
             hb_qt_font_set_use_design_metrics(hb_font, option.useDesignMetrics() ? uint(QFontEngine::DesignMetrics) : 0); // ###
 
             const hb_feature_t features[1] = {
-                { HB_TAG('k','e','r','n'), !!kerningEnabled, 0, -1 }
+                { HB_TAG('k','e','r','n'), !!kerningEnabled, 0, uint(-1) }
             };
             const int num_features = 1;
             shapedOk = hb_shape_full(hb_font, buffer, features, num_features, 0);