diff --git a/tests/auto/gui/painting/qcolortransform/tst_qcolortransform.cpp b/tests/auto/gui/painting/qcolortransform/tst_qcolortransform.cpp
index 06e8db3e..afe08dc4 100644
--- a/tests/auto/gui/painting/qcolortransform/tst_qcolortransform.cpp
+++ b/tests/auto/gui/painting/qcolortransform/tst_qcolortransform.cpp
@@ -182,25 +182,33 @@ void tst_QColorTransform::mapRGBAFP16x4()
     else
         QVERIFY(result != testColor);
 
-    testColor = QRgbaFloat16{0.0f, 0.0f, 0.0f, 1.0f};
+    float floatValueZero = 0.0f;
+    qfloat16 float16ValueZero;
+    qFloatToFloat16(&float16ValueZero, &floatValueZero, 1);
+
+    float floatValueOne = 1.0f;
+    qfloat16 float16ValueOne;
+    qFloatToFloat16(&float16ValueOne, &floatValueOne, 1);
+
+    testColor = QRgbaFloat16{float16ValueZero, float16ValueZero, float16ValueZero, float16ValueOne};
     result = transform.map(testColor);
     QCOMPARE(result, testColor);
 
-    testColor = QRgbaFloat16{1.0f, 1.0f, 1.0f, 1.0f};
+    testColor = QRgbaFloat16{float16ValueOne, float16ValueOne, float16ValueOne, float16ValueOne};
     result = transform.map(testColor);
     QCOMPARE(result, testColor);
 
-    testColor = QRgbaFloat16{1.0f, 1.0f, 0.0f, 1.0f};
+    testColor = QRgbaFloat16{float16ValueOne, float16ValueOne, float16ValueZero, float16ValueOne};
     result = transform.map(testColor);
-    QCOMPARE(result.alpha(), 1.0f);
+    QCOMPARE(result.alpha(), float16ValueOne);
     if (sharesRed)
-        QCOMPARE(result.red(), 1.0f);
+        QCOMPARE(result.red(), float16ValueOne);
 
-    testColor = QRgbaFloat16{0.0f, 1.0f, 1.0f, 1.0f};
+    testColor = QRgbaFloat16{float16ValueZero, float16ValueOne, float16ValueOne, float16ValueOne};
     result = transform.map(testColor);
     // QRgbaFloat16 might overflow blue if we convert to a smaller gamut:
     QCOMPARE(result.blue16(), 65535);
-    QCOMPARE(result.alpha(), 1.0f);
+    QCOMPARE(result.alpha(), float16ValueOne);
 }
 
 void tst_QColorTransform::mapRGBAFP32x4_data()
diff --git a/tests/auto/gui/rhi/qrhi/tst_qrhi.cpp b/tests/auto/gui/rhi/qrhi/tst_qrhi.cpp
index 942ee06f..1cc1b14b 100644
--- a/tests/auto/gui/rhi/qrhi/tst_qrhi.cpp
+++ b/tests/auto/gui/rhi/qrhi/tst_qrhi.cpp
@@ -6699,10 +6699,22 @@ void tst_QRhi::halfPrecisionAttributes()
     //
     // To avoid these errors, we pad the vertices to 8 byte stride.
     //
+    float floatValueZero = 0.0f;
+    qfloat16 float16ValueZero;
+    qFloatToFloat16(&float16ValueZero, &floatValueZero, 1);
+
+    float floatValueOne = 1.0f;
+    qfloat16 float16ValueOne;
+    qFloatToFloat16(&float16ValueOne, &floatValueOne, 1);
+
+    float floatValueMinusOne = -1.0f;
+    qfloat16 float16ValueMinusOne;
+    qFloatToFloat16(&float16ValueMinusOne, &floatValueMinusOne, 1);
+
     static const qfloat16 vertices[] = {
-        -1.0, -1.0, 0.0, 0.0,
-        1.0, -1.0, 0.0, 0.0,
-        0.0, 1.0, 0.0, 0.0,
+        float16ValueMinusOne, float16ValueMinusOne, float16ValueZero, float16ValueZero,
+        float16ValueOne, float16ValueMinusOne, float16ValueZero, float16ValueZero,
+        float16ValueZero, float16ValueOne, float16ValueZero, float16ValueZero,
     };
 
     QScopedPointer<QRhiBuffer> vbuf(rhi->newBuffer(QRhiBuffer::Immutable, QRhiBuffer::VertexBuffer, sizeof(vertices)));