diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e167e572..e251717bc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,7 +40,7 @@ add_definitions(
   -DQT_NO_FOREACH
   -DQT_NO_CAST_FROM_ASCII
   -DQT_NO_CAST_TO_ASCII
- #-DQT_NO_CAST_FROM_BYTEARRAY
+  -DQT_NO_CAST_FROM_BYTEARRAY
   -DQT_NO_URL_CAST_FROM_STRING
   -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT
   -DQT_NO_CONTEXTLESS_CONNECT
diff --git a/src/lib/dataloggerservice.cpp b/src/lib/dataloggerservice.cpp
index 89b6ea661..b595bea61 100644
--- a/src/lib/dataloggerservice.cpp
+++ b/src/lib/dataloggerservice.cpp
@@ -404,7 +404,7 @@ DataLoggerService::Metadata DataLoggerServicePrivate::parseMetadata(const QByteA
 
     qCDebug(lc) << value.mid(7,12).toHex(',');
     metadata.status = static_cast<DataLoggerService::LoggerStatus>(value.at(0));
-    metadata.scale  = qFromLittleEndian<float>(value.mid(1,4));
+    metadata.scale  = qFromLittleEndian<float>(value.mid(1,4).constData());
     metadata.mode   = static_cast<DataLoggerService::Mode>(value.at(5));
     metadata.range  = static_cast<quint8>(value.at(6));
 
@@ -416,13 +416,13 @@ DataLoggerService::Metadata DataLoggerServicePrivate::parseMetadata(const QByteA
      */
 
     if (value.size() == 15) {
-        metadata.updateInterval  = qFromLittleEndian<quint16>(value.mid(7,2))*1000;
-        metadata.numberOfSamples = qFromLittleEndian<quint16>(value.mid(9,2));
-        metadata.timestamp       = qFromLittleEndian<quint32>(value.mid(11,4));
+        metadata.updateInterval  = qFromLittleEndian<quint16>(value.mid(7,2).constData())*1000;
+        metadata.numberOfSamples = qFromLittleEndian<quint16>(value.mid(9,2).constData());
+        metadata.timestamp       = qFromLittleEndian<quint32>(value.mid(11,4).constData());
     } else if (value.size() == 23) {
-        metadata.updateInterval  = qFromLittleEndian<quint32>(value.mid(7,4));
-        metadata.numberOfSamples = qFromLittleEndian<quint16>(value.mid(11,2));
-        metadata.timestamp       = qFromLittleEndian<quint32>(value.mid(19,4));
+        metadata.updateInterval  = qFromLittleEndian<quint32>(value.mid(7,4).constData());
+        metadata.numberOfSamples = qFromLittleEndian<quint16>(value.mid(11,2).constData());
+        metadata.timestamp       = qFromLittleEndian<quint32>(value.mid(19,4).constData());
     } else {
         qCWarning(lc).noquote() << tr("Cannot decode metadata of %n byte/s: %1", nullptr, value.size())
             .arg(toHexString(value));
@@ -442,7 +442,7 @@ DataLoggerService::Samples DataLoggerServicePrivate::parseSamples(const QByteArr
         return samples;
     }
     while ((samples.size()*2) < value.size()) {
-        samples.append(qFromLittleEndian<qint16>(value.mid(samples.size()*2,2)));
+        samples.append(qFromLittleEndian<qint16>(value.mid(samples.size()*2,2).constData()));
     }
     qCDebug(lc).noquote() << tr("Read %n sample/s from %1-bytes.", nullptr, samples.size()).arg(value.size());
     return samples;
diff --git a/src/lib/dsoservice.cpp b/src/lib/dsoservice.cpp
index 01bba0d97..b9a27887a 100644
--- a/src/lib/dsoservice.cpp
+++ b/src/lib/dsoservice.cpp
@@ -366,12 +366,12 @@ DsoService::Metadata DsoServicePrivate::parseMetadata(const QByteArray &value)
     }
 
     metadata.status          = static_cast<DsoService::DsoStatus>(value.at(0));
-    metadata.scale           = qFromLittleEndian<float>(value.mid(1,4));
+    metadata.scale           = qFromLittleEndian<float>(value.mid(1,4).constData());
     metadata.mode            = static_cast<DsoService::Mode>(value.at(5));
     metadata.range           = static_cast<quint8>(value.at(6));
-    metadata.samplingWindow  = qFromLittleEndian<quint32>(value.mid(7,4));
-    metadata.numberOfSamples = qFromLittleEndian<quint16>(value.mid(11,2));
-    metadata.samplingRate    = qFromLittleEndian<quint32>(value.mid(13,4));
+    metadata.samplingWindow  = qFromLittleEndian<quint32>(value.mid(7,4).constData());
+    metadata.numberOfSamples = qFromLittleEndian<quint16>(value.mid(11,2).constData());
+    metadata.samplingRate    = qFromLittleEndian<quint32>(value.mid(13,4).constData());
     return metadata;
 }
 
@@ -387,7 +387,7 @@ DsoService::Samples DsoServicePrivate::parseSamples(const QByteArray &value)
         return samples;
     }
     while ((samples.size()*2) < value.size()) {
-        samples.append(qFromLittleEndian<qint16>(value.mid(samples.size()*2,2)));
+        samples.append(qFromLittleEndian<qint16>(value.mid(samples.size()*2,2).constData()));
     }
     qCDebug(lc).noquote() << tr("Read %n sample/s from %1-bytes.", nullptr, samples.size()).arg(value.size());
     return samples;
diff --git a/src/lib/genericaccessservice.cpp b/src/lib/genericaccessservice.cpp
index d2b97bee3..f877b7117 100644
--- a/src/lib/genericaccessservice.cpp
+++ b/src/lib/genericaccessservice.cpp
@@ -203,7 +203,7 @@ quint16 GenericAccessServicePrivate::parseAppearance(const QByteArray &value)
     if (!checkSize(QLatin1String("Appearance"), value, 2, 2)) {
         return std::numeric_limits<quint16>::max();
     }
-    const quint16 appearance = qFromLittleEndian<quint16>(value);
+    const quint16 appearance = qFromLittleEndian<quint16>(value.constData());
     qCDebug(lc).noquote() << tr("Appearance: %1.").arg(appearance);
     return appearance;
 }
diff --git a/src/lib/multimeterservice.cpp b/src/lib/multimeterservice.cpp
index 26dd17e92..26eb725a8 100644
--- a/src/lib/multimeterservice.cpp
+++ b/src/lib/multimeterservice.cpp
@@ -317,7 +317,7 @@ MultimeterService::Reading MultimeterServicePrivate::parseReading(const QByteArr
     }
 
     reading.status = MultimeterService::MeterStatus(value.at(0));
-    reading.value  = qFromLittleEndian<float>(value.mid(1,4));
+    reading.value  = qFromLittleEndian<float>(value.mid(1,4).constData());
     reading.mode   = static_cast<MultimeterService::Mode>(value.at(5));
     reading.range  = static_cast<quint8>(value.at(6));
     return reading;
diff --git a/src/lib/statusservice.cpp b/src/lib/statusservice.cpp
index 371edcd9b..d14c9a19c 100644
--- a/src/lib/statusservice.cpp
+++ b/src/lib/statusservice.cpp
@@ -594,16 +594,16 @@ StatusService::DeviceCharacteristics StatusServicePrivate::parseDeviceCharacteri
     }
 
     characteristics.firmwareVersion = QVersionNumber(
-                                          qFromLittleEndian<quint8 >(value.mid(0,1)),
-                                          qFromLittleEndian<quint8 >(value.mid(1,1)));
-    characteristics.maximumVoltage      = qFromLittleEndian<quint16>(value.mid(2,2));
-    characteristics.maximumCurrent      = qFromLittleEndian<quint16>(value.mid(4,2));
-    characteristics.maximumResistance   = qFromLittleEndian<quint16>(value.mid(6,2));
-    characteristics.maximumSamplingRate = qFromLittleEndian<quint16>(value.mid(8,2));
-    characteristics.samplingBufferSize  = qFromLittleEndian<quint16>(value.mid(10,2));
-    characteristics.capabilityMask      = qFromLittleEndian<quint16>(value.mid(12,2));
+                                          qFromLittleEndian<quint8 >(value.mid(0,1).constData()),
+                                          qFromLittleEndian<quint8 >(value.mid(1,1).constData()));
+    characteristics.maximumVoltage      = qFromLittleEndian<quint16>(value.mid(2,2).constData());
+    characteristics.maximumCurrent      = qFromLittleEndian<quint16>(value.mid(4,2).constData());
+    characteristics.maximumResistance   = qFromLittleEndian<quint16>(value.mid(6,2).constData());
+    characteristics.maximumSamplingRate = qFromLittleEndian<quint16>(value.mid(8,2).constData());
+    characteristics.samplingBufferSize  = qFromLittleEndian<quint16>(value.mid(10,2).constData());
+    characteristics.capabilityMask      = qFromLittleEndian<quint16>(value.mid(12,2).constData());
     characteristics.macAddress = QBluetoothAddress(qFromBigEndian<quint64>
-                                                   (QByteArray(2, '\0') + value.mid(14,6)));
+                                                   ((QByteArray(2, '\0') + value.mid(14,6)).constData()));
 
     qCDebug(lc).noquote() << tr("Firmware version:     ") << characteristics.firmwareVersion;
     qCDebug(lc).noquote() << tr("Maximum voltage:      ") << characteristics.maximumVoltage;
@@ -646,7 +646,7 @@ StatusService::Status StatusServicePrivate::parseStatus(const QByteArray &value)
     }
 
     status.deviceStatus = static_cast<StatusService::DeviceStatus>(value.at(0));
-    status.batteryVoltage = qFromLittleEndian<float>(value.mid(1,4));
+    status.batteryVoltage = qFromLittleEndian<float>(value.mid(1,4).constData());
     if (value.size() >= 6) { // Battery Status added to Pokit API docs v1.00.
         status.batteryStatus = static_cast<StatusService::BatteryStatus>(value.at(5));
     }