diff --git a/src/app/main.cpp b/src/app/main.cpp
index 21730827f..3eccdc1ce 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -127,10 +127,12 @@ namespace
 #endif
     }
 
+#if !defined(Q_OS_WIN) || defined(DISABLE_GUI)
     void displayVersion()
     {
         printf("%s %s\n", qUtf8Printable(qApp->applicationName()), QBT_VERSION);
     }
+#endif
 
 #ifndef DISABLE_GUI
     void showSplashScreen()
diff --git a/src/base/path.cpp b/src/base/path.cpp
index c1357f3cf..e746fbf5c 100644
--- a/src/base/path.cpp
+++ b/src/base/path.cpp
@@ -65,7 +65,7 @@ namespace
     bool hasDriveLetter(const QStringView path)
     {
         const QRegularExpression driveLetterRegex {u"^[A-Za-z]:/"_s};
-        return driveLetterRegex.match(path).hasMatch();
+        return driveLetterRegex.matchView(path).hasMatch();
     }
 #endif
 }
@@ -104,7 +104,7 @@ bool Path::isValid() const
 
     // \\37 is using base-8 number system
     const QRegularExpression regex {u"[\\0-\\37:?\"*<>|]"_s};
-    return !regex.match(view).hasMatch();
+    return !regex.matchView(view).hasMatch();
 #elif defined(Q_OS_MACOS)
     const QRegularExpression regex {u"[\\0:]"_s};
 #else
diff --git a/src/base/utils/os.cpp b/src/base/utils/os.cpp
index f0a78b132..ad1cd4057 100644
--- a/src/base/utils/os.cpp
+++ b/src/base/utils/os.cpp
@@ -275,11 +275,11 @@ bool Utils::OS::applyMarkOfTheWeb(const Path &file, const QString &url)
     const QByteArray zoneID = QByteArrayLiteral("[ZoneTransfer]\r\nZoneId=3\r\n")
         + u"HostUrl=%1\r\n"_s.arg(hostURL).toUtf8();
 
-    if (LARGE_INTEGER streamSize = {0};
+    if (LARGE_INTEGER streamSize {};
         ::GetFileSizeEx(handle, &streamSize) && (streamSize.QuadPart > 0))
     {
         const DWORD expectedReadSize = std::min<LONGLONG>(streamSize.QuadPart, 1024);
-        QByteArray buf {expectedReadSize, '\0'};
+        QByteArray buf {static_cast<qsizetype>(expectedReadSize), '\0'};
 
         if (DWORD actualReadSize = 0;
             ::ReadFile(handle, buf.data(), expectedReadSize, &actualReadSize, nullptr) && (actualReadSize == expectedReadSize))
@@ -289,14 +289,14 @@ bool Utils::OS::applyMarkOfTheWeb(const Path &file, const QString &url)
         }
     }
 
-    if (!::SetFilePointerEx(handle, {0}, nullptr, FILE_BEGIN))
+    if (!::SetFilePointerEx(handle, {}, nullptr, FILE_BEGIN))
         return false;
     if (!::SetEndOfFile(handle))
         return false;
 
     DWORD written = 0;
     const BOOL writeResult = ::WriteFile(handle, zoneID.constData(), zoneID.size(), &written, nullptr);
-    return writeResult && (written == zoneID.size());
+    return writeResult && (static_cast<qsizetype>(written) == zoneID.size());
 #endif
 }
 #endif // Q_OS_MACOS || Q_OS_WIN