diff --git a/src/bluetooth/android/jni_android.cpp b/src/bluetooth/android/jni_android.cpp
index 6bbc3bb0..c316a341 100644
--- a/src/bluetooth/android/jni_android.cpp
+++ b/src/bluetooth/android/jni_android.cpp
@@ -132,9 +132,9 @@ QJniObject valueForStaticField(JavaNames javaName, JavaNames javaFieldName)
         return QJniObject();
     }
 
-    int offset_class = qstrlen(className);
-    int offset_field = qstrlen(fieldName);
-    QByteArray key(offset_class + offset_field, Qt::Uninitialized);
+    const size_t offset_class = qstrlen(className);
+    const size_t offset_field = qstrlen(fieldName);
+    QByteArray key(qsizetype(offset_class + offset_field), Qt::Uninitialized);
     memcpy(key.data(), className, offset_class);
     memcpy(key.data()+offset_class, fieldName, offset_field);
 
diff --git a/src/bluetooth/qbluetoothserviceinfo_winrt.cpp b/src/bluetooth/qbluetoothserviceinfo_winrt.cpp
index 780dbf2c..e2be5104 100644
--- a/src/bluetooth/qbluetoothserviceinfo_winrt.cpp
+++ b/src/bluetooth/qbluetoothserviceinfo_winrt.cpp
@@ -158,7 +158,7 @@ bool writeStringHelper(const QString &string, ComPtr<IDataWriter> writer)
     quint32 bytesWritten;
     hr = writer->WriteString(stringRef.Get(), &bytesWritten);
     RETURN_FALSE_IF_FAILED("Could not write string to buffer.");
-    if (bytesWritten != string.length()) {
+    if (bytesWritten != size_t(string.size())) {
         qCWarning(QT_BT_WINDOWS) << "Did not write full value to buffer";
         return false;
     }