diff --git a/src/gui/painting/qcosmeticstroker.cpp b/src/gui/painting/qcosmeticstroker.cpp
index a0eddf65d91..5c6141ead77 100644
--- a/src/gui/painting/qcosmeticstroker.cpp
+++ b/src/gui/painting/qcosmeticstroker.cpp
@@ -237,12 +237,12 @@ void QCosmeticStroker::setup()
 
         patternLength = 0;
         for (int i = 0; i < patternSize; ++i) {
-            patternLength += static_cast<int>(qBound(1., penPattern.at(i) * 64, 65536.));
+            patternLength += qBound(1, int(penPattern.at(i) * 64), 65536);
             pattern[i] = patternLength;
         }
         patternLength = 0;
         for (int i = 0; i < patternSize; ++i) {
-            patternLength += static_cast<int>(qBound(1., penPattern.at(patternSize - 1 - i) * 64, 65536.));
+            patternLength += qBound(1, int(penPattern.at(patternSize - 1 - i) * 64), 65536);
             reversePattern[i] = patternLength;
         }
         strokeSelection |= Dashed;
diff --git a/src/gui/painting/qpdf.cpp b/src/gui/painting/qpdf.cpp
index 285d2e3f4a9..6028bf02388 100644
--- a/src/gui/painting/qpdf.cpp
+++ b/src/gui/painting/qpdf.cpp
@@ -2734,10 +2734,12 @@ QPdfEnginePrivate::createShadingFunction(const QGradient *gradient, int from, in
                 s << "/C0 [" << stops.at(i).second.redF() << stops.at(i).second.greenF() <<  stops.at(i).second.blueF() << "]\n"
                      "/C1 [" << stops.at(i + 1).second.redF() << stops.at(i + 1).second.greenF() <<  stops.at(i + 1).second.blueF() << "]\n";
                 break;
-            case QPdfEngine::ColorModel::Grayscale:
-                s << "/C0 [" << (qGray(stops.at(i).second.rgba()) / 255.) << "]\n"
-                     "/C1 [" << (qGray(stops.at(i + 1).second.rgba()) / 255.) << "]\n";
+            case QPdfEngine::ColorModel::Grayscale: {
+                constexpr qreal normalisationFactor = 1. / 255.;
+                s << "/C0 [" << (qGray(stops.at(i).second.rgba()) * normalisationFactor) << "]\n"
+                     "/C1 [" << (qGray(stops.at(i + 1).second.rgba()) * normalisationFactor) << "]\n";
                 break;
+            }
             case QPdfEngine::ColorModel::CMYK:
                 s << "/C0 [" << stops.at(i).second.cyanF()
                              << stops.at(i).second.magentaF()
diff --git a/src/gui/text/unix/qfontconfigdatabase.cpp b/src/gui/text/unix/qfontconfigdatabase.cpp
index d607d38235c..f6c593806e6 100644
--- a/src/gui/text/unix/qfontconfigdatabase.cpp
+++ b/src/gui/text/unix/qfontconfigdatabase.cpp
@@ -548,7 +548,7 @@ static void populateFromPattern(FcPattern *pattern,
 
 static bool isDprScaling()
 {
-    return !qFuzzyCompare(qApp->devicePixelRatio(), 1.0);
+    return !qFuzzyCompare(qApp->devicePixelRatio(), qreal(1.0));
 }
 
 QFontconfigDatabase::~QFontconfigDatabase()
diff --git a/src/testlib/qbenchmarkmeasurement.cpp b/src/testlib/qbenchmarkmeasurement.cpp
index 32a066967a5..9af250b7179 100644
--- a/src/testlib/qbenchmarkmeasurement.cpp
+++ b/src/testlib/qbenchmarkmeasurement.cpp
@@ -51,7 +51,7 @@ void QBenchmarkTickMeasurer::start()
 QList<QBenchmarkMeasurerBase::Measurement> QBenchmarkTickMeasurer::stop()
 {
     CycleCounterTicks now = getticks();
-    return { { elapsed(now, startTicks), QTest::CPUTicks } };
+    return { { qreal(elapsed(now, startTicks)), QTest::CPUTicks } };
 }
 
 bool QBenchmarkTickMeasurer::isMeasurementAccepted(QBenchmarkMeasurerBase::Measurement)
diff --git a/src/testlib/qplaintestlogger.cpp b/src/testlib/qplaintestlogger.cpp
index 290d4253742..250015f7d62 100644
--- a/src/testlib/qplaintestlogger.cpp
+++ b/src/testlib/qplaintestlogger.cpp
@@ -79,7 +79,7 @@ template <int N> struct FixedBufString
         qint64 ratio;
         if (v < 1 && Power == 1000) {
             const char *prefixes = submultiplePrefixes;
-            ratio = qreal(std::atto::num) / std::atto::den;
+            ratio = qreal(std::atto::num) / qreal(std::atto::den);
             while (value * ratio > 1000 && *prefixes) {
                 ++prefixes;
                 ratio *= 1000;