diff --git a/src/app/qtlocalpeer/qtlocalpeer.cpp b/src/app/qtlocalpeer/qtlocalpeer.cpp
index 757f6a08f..5e9dbe797 100644
--- a/src/app/qtlocalpeer/qtlocalpeer.cpp
+++ b/src/app/qtlocalpeer/qtlocalpeer.cpp
@@ -152,10 +152,10 @@ bool QtLocalPeer::sendMessage(const QString &message, const int timeout)
             break;
         int ms = 250;
 #if defined(Q_OS_WIN)
-        Sleep(DWORD(ms));
+        ::Sleep(DWORD(ms));
 #else
         struct timespec ts = { ms / 1000, (ms % 1000) * 1000 * 1000 };
-        nanosleep(&ts, NULL);
+        ::nanosleep(&ts, nullptr);
 #endif
     }
     if (!connOk)
diff --git a/src/base/bittorrent/filterparserthread.cpp b/src/base/bittorrent/filterparserthread.cpp
index eb599fa6b..cdd8f88b1 100644
--- a/src/base/bittorrent/filterparserthread.cpp
+++ b/src/base/bittorrent/filterparserthread.cpp
@@ -484,9 +484,9 @@ int FilterParserThread::parseP2BFilterFile()
     char buf[7];
     unsigned char version;
     if (!stream.readRawData(buf, sizeof(buf))
-        || memcmp(buf, "\xFF\xFF\xFF\xFFP2B", 7)
+        || (memcmp(buf, "\xFF\xFF\xFF\xFFP2B", 7) != 0)
         || !stream.readRawData(reinterpret_cast<char*>(&version), sizeof(version)))
-        {
+    {
         LogMsg(tr("Parsing Error: The filter file is not a valid PeerGuardian P2B file."), Log::CRITICAL);
         return ruleCount;
     }
diff --git a/src/base/bittorrent/infohash.cpp b/src/base/bittorrent/infohash.cpp
index dcef97874..e4ee0f08d 100644
--- a/src/base/bittorrent/infohash.cpp
+++ b/src/base/bittorrent/infohash.cpp
@@ -93,7 +93,7 @@ BitTorrent::InfoHash::operator WrappedType() const
 
 BitTorrent::TorrentID BitTorrent::TorrentID::fromString(const QString &hashString)
 {
-    return TorrentID(BaseType::fromString(hashString));
+    return {BaseType::fromString(hashString)};
 }
 
 BitTorrent::TorrentID BitTorrent::TorrentID::fromInfoHash(const BitTorrent::InfoHash &infoHash)
@@ -103,7 +103,7 @@ BitTorrent::TorrentID BitTorrent::TorrentID::fromInfoHash(const BitTorrent::Info
 
 BitTorrent::TorrentID BitTorrent::TorrentID::fromSHA1Hash(const SHA1Hash &hash)
 {
-    return TorrentID(hash);
+    return {hash};
 }
 
 BitTorrent::TorrentID BitTorrent::TorrentID::fromSHA256Hash(const SHA256Hash &hash)
diff --git a/src/base/bittorrent/sessionimpl.h b/src/base/bittorrent/sessionimpl.h
index 475a31a29..449a7f44e 100644
--- a/src/base/bittorrent/sessionimpl.h
+++ b/src/base/bittorrent/sessionimpl.h
@@ -380,7 +380,7 @@ namespace BitTorrent
         bool isExcludedFileNamesEnabled() const override;
         void setExcludedFileNamesEnabled(bool enabled) override;
         QStringList excludedFileNames() const override;
-        void setExcludedFileNames(const QStringList &newList) override;
+        void setExcludedFileNames(const QStringList &excludedFileNames) override;
         bool isFilenameExcluded(const QString &fileName) const override;
         QStringList bannedIPs() const override;
         void setBannedIPs(const QStringList &newList) override;
diff --git a/src/base/bittorrent/torrentimpl.cpp b/src/base/bittorrent/torrentimpl.cpp
index b064fd5e7..4abc49c6a 100644
--- a/src/base/bittorrent/torrentimpl.cpp
+++ b/src/base/bittorrent/torrentimpl.cpp
@@ -98,7 +98,7 @@ namespace
         QString firstTrackerMessage;
         QString firstErrorMessage;
 #ifdef QBT_USES_LIBTORRENT2
-        const auto numEndpoints = static_cast<qsizetype>(nativeEntry.endpoints.size() * ((hashes.has_v1() && hashes.has_v2()) ? 2 : 1));
+        const auto numEndpoints = static_cast<qsizetype>(nativeEntry.endpoints.size()) * ((hashes.has_v1() && hashes.has_v2()) ? 2 : 1);
         for (const lt::announce_endpoint &endpoint : nativeEntry.endpoints)
         {
             for (const auto protocolVersion : {lt::protocol_version::V1, lt::protocol_version::V2})
diff --git a/src/base/profile_p.cpp b/src/base/profile_p.cpp
index 57a56beb0..e27a232a4 100644
--- a/src/base/profile_p.cpp
+++ b/src/base/profile_p.cpp
@@ -116,9 +116,9 @@ Path Private::DefaultProfile::downloadLocation() const
 std::unique_ptr<QSettings> Private::DefaultProfile::applicationSettings(const QString &name) const
 {
 #if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
-    return std::unique_ptr<QSettings>(new QSettings(QSettings::IniFormat, QSettings::UserScope, profileName(), name));
+    return std::make_unique<QSettings>(QSettings::IniFormat, QSettings::UserScope, profileName(), name);
 #else
-    return std::unique_ptr<QSettings>(new QSettings(profileName(), name));
+    return std::make_unique<QSettings>(profileName(), name);
 #endif
 }
 
diff --git a/src/gui/desktopintegration.cpp b/src/gui/desktopintegration.cpp
index 825d8cb99..ad5c7cae9 100644
--- a/src/gui/desktopintegration.cpp
+++ b/src/gui/desktopintegration.cpp
@@ -100,8 +100,7 @@ DesktopIntegration::DesktopIntegration(QObject *parent)
 
 DesktopIntegration::~DesktopIntegration()
 {
-    if (m_menu)
-        delete m_menu;
+    delete m_menu;
 }
 
 bool DesktopIntegration::isActive() const