diff --git a/docroot/js/mediaplayer.js b/docroot/js/mediaplayer.js
index 31ffa05d..cd4f7da9 100644
--- a/docroot/js/mediaplayer.js
+++ b/docroot/js/mediaplayer.js
@@ -156,7 +156,7 @@ LMS.mediaplayer = function () {
 		_elems.volumeslider = document.getElementById("lms-mp-volume-slider");
 		_elems.transcodingActive = document.getElementById("lms-transcoding-active");
 
-		$(_elems.transcodingActive).tooltip()
+		$(_elems.transcodingActive).tooltip();
 
 		var source = _audioCtx.createMediaElementSource(_elems.audio);
 		source.connect(_gainNode);
diff --git a/src/libs/cover/impl/stb/JPEGImage.hpp b/src/libs/cover/impl/stb/JPEGImage.hpp
index 2ef7aa76..3256cd10 100644
--- a/src/libs/cover/impl/stb/JPEGImage.hpp
+++ b/src/libs/cover/impl/stb/JPEGImage.hpp
@@ -17,6 +17,8 @@
  * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #include <vector>
 
 #include "cover/IEncodedImage.hpp"
diff --git a/src/libs/database/include/database/Track.hpp b/src/libs/database/include/database/Track.hpp
index 4a8849ec..4bbb4b5e 100644
--- a/src/libs/database/include/database/Track.hpp
+++ b/src/libs/database/include/database/Track.hpp
@@ -93,8 +93,8 @@ class Track : public Wt::Dbo::Dbo<Track>
 		void setScanVersion(std::size_t version)			{ _scanVersion = version; }
 		void setTrackNumber(int num)					{ _trackNumber = num; }
 		void setDiscNumber(int num)					{ _discNumber = num; }
-		void setTotalTrack(std::optional<int> totalTrack)		{ totalTrack ? _totalTrack = *totalTrack : 0; }
-		void setTotalDisc(std::optional<int> totalDisc)			{ totalDisc ? _totalDisc = *totalDisc : 0; }
+		void setTotalTrack(std::optional<int> totalTrack)		{ _totalTrack = totalTrack ? *totalTrack : 0; }
+		void setTotalDisc(std::optional<int> totalDisc)			{ _totalDisc = totalDisc ? *totalDisc : 0; }
 		void setDiscSubtitle(const std::string& name)			{ _discSubtitle = name; }
 		void setName(const std::string& name)				{ _name = std::string(name, 0, _maxNameLength); }
 		void setDuration(std::chrono::milliseconds duration)		{ _duration = duration; }
diff --git a/src/libs/metadata/impl/TagLibParser.cpp b/src/libs/metadata/impl/TagLibParser.cpp
index 85497ab8..e4cbb4e2 100644
--- a/src/libs/metadata/impl/TagLibParser.cpp
+++ b/src/libs/metadata/impl/TagLibParser.cpp
@@ -280,9 +280,9 @@ TagLibParser::processTag(Track& track, const std::string& tag, const TagLib::Str
 		std::set<std::string> clusterNames;
 		for (const auto& valueList : values)
 		{
-			auto values = splitAndTrimString(valueList.to8Bit(true), "/,;");
+			const auto splittedValues {splitAndTrimString(valueList.to8Bit(true), "/,;")};
 
-			for (const auto& value : values)
+			for (const auto& value : splittedValues)
 				clusterNames.insert(value);
 		}
 
diff --git a/src/libs/recommendation/impl/features/FeaturesClassifier.cpp b/src/libs/recommendation/impl/features/FeaturesClassifier.cpp
index 119f71de..a98011de 100644
--- a/src/libs/recommendation/impl/features/FeaturesClassifier.cpp
+++ b/src/libs/recommendation/impl/features/FeaturesClassifier.cpp
@@ -296,8 +296,8 @@ FeaturesClassifier::getSimilarReleases(Database::Session& session, Database::IdT
 
 		for (auto it {std::begin(similarReleaseIds)}; it != std::end(similarReleaseIds);)
 		{
-			const Database::IdType releaseId {*it};
-			if (!Database::Release::getById(session, releaseId))
+			const Database::IdType similarReleaseId {*it};
+			if (!Database::Release::getById(session, similarReleaseId))
 				it = similarReleaseIds.erase(it);
 			else
 				it++;
@@ -318,8 +318,8 @@ FeaturesClassifier::getSimilarArtists(Database::Session& session, Database::IdTy
 
 		for (auto it {std::begin(similarArtistIds)}; it != std::end(similarArtistIds);)
 		{
-			const Database::IdType artistId {*it};
-			if (!Database::Release::getById(session, artistId))
+			const Database::IdType similarArtistId {*it};
+			if (!Database::Release::getById(session, similarArtistId))
 				it = similarArtistIds.erase(it);
 			else
 				it++;
diff --git a/src/libs/scanner/impl/MediaScanner.cpp b/src/libs/scanner/impl/MediaScanner.cpp
index f8759b52..d82b63e7 100644
--- a/src/libs/scanner/impl/MediaScanner.cpp
+++ b/src/libs/scanner/impl/MediaScanner.cpp
@@ -19,6 +19,7 @@
 
 #include "MediaScanner.hpp"
 
+#include <ctime>
 #include <boost/asio/placeholders.hpp>
 
 #include <Wt/WLocalDateTime.h>
@@ -458,8 +459,9 @@ MediaScanner::scheduleScan(bool force, const Wt::WDateTime& dateTime)
 	{
 		std::chrono::system_clock::time_point timePoint {dateTime.toTimePoint()};
 		std::time_t t {std::chrono::system_clock::to_time_t(timePoint)};
+		char ctimeStr[26];
 
-		LMS_LOG(DBUPDATER, INFO) << "Scheduling next scan at " << std::string(std::ctime(&t));
+		LMS_LOG(DBUPDATER, INFO) << "Scheduling next scan at " << std::string(::ctime_r(&t, ctimeStr));
 		_scheduleTimer.expires_at(timePoint);
 		_scheduleTimer.async_wait(cb);
 	}
diff --git a/src/libs/som/include/som/Matrix.hpp b/src/libs/som/include/som/Matrix.hpp
index 2688d729..3148d1d8 100644
--- a/src/libs/som/include/som/Matrix.hpp
+++ b/src/libs/som/include/som/Matrix.hpp
@@ -57,23 +57,23 @@ class Matrix
 		Matrix() = default;
 
 		Matrix(Coordinate width, Coordinate height)
-		: _width{width},
-		_height{height}
+		: _width {width}
+		, _height {height}
 		{
-			_values.resize(_width*_height);
+			_values.resize(static_cast<std::size_t>(_width) * static_cast<std::size_t>(_height));
 		}
 
 		template<typename... CtArgs>
 		Matrix(Coordinate width, Coordinate height, CtArgs... args)
-		: _width{width},
-		_height{height}
+		: _width {width}
+		, _height {height}
 		{
-			 _values.resize(_width*_height, T{args...});
+			 _values.resize(static_cast<std::size_t>(_width) * static_cast<std::size_t>(_height), T{args...});
 		}
 
 		void clear()
 		{
-			std::vector<T> values(_width*_height);
+			std::vector<T> values(static_cast<std::size_t>(_width) * static_cast<std::size_t>(_height));
 			_values.swap(values);
 		}
 
@@ -112,7 +112,7 @@ class Matrix
 
 		Coordinate		_width {};
 		Coordinate		_height {};
-		std::vector<T>		_values;
+		std::vector<T>	_values;
 };
 
 } // ns SOM
diff --git a/src/libs/subsonic/impl/SubsonicResource.cpp b/src/libs/subsonic/impl/SubsonicResource.cpp
index 3d93e980..322a5817 100644
--- a/src/libs/subsonic/impl/SubsonicResource.cpp
+++ b/src/libs/subsonic/impl/SubsonicResource.cpp
@@ -19,6 +19,7 @@
 #include "subsonic/SubsonicResource.hpp"
 
 #include <atomic>
+#include <ctime>
 #include <iomanip>
 #include <unordered_map>
 
@@ -385,7 +386,8 @@ releaseToResponseNode(const Release::pointer& release, Session& dbSession, const
 
 	{
 		std::time_t t {release->getLastWritten().toTime_t()};
-		std::ostringstream oss; oss << std::put_time(std::gmtime(&t), "%FT%T");
+		std::tm gmTime;
+		std::ostringstream oss; oss << std::put_time(::gmtime_r(&t, &gmTime), "%FT%T");
 		albumNode.setAttribute("created", oss.str());
 	}
 
diff --git a/src/libs/utils/include/utils/NetAddress.hpp b/src/libs/utils/include/utils/NetAddress.hpp
index ae142775..22bc8d7e 100644
--- a/src/libs/utils/include/utils/NetAddress.hpp
+++ b/src/libs/utils/include/utils/NetAddress.hpp
@@ -17,6 +17,8 @@
  * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#pragma once
+
 #include <boost/asio/ip/address.hpp>
 
 namespace std