diff --git a/src/base/preferences.cpp b/src/base/preferences.cpp
index 42a34b25a..69475fad5 100644
--- a/src/base/preferences.cpp
+++ b/src/base/preferences.cpp
@@ -1186,7 +1186,7 @@ int Preferences::getPropCurTab() const
     return value("TorrentProperties/CurrentTab", -1).toInt();
 }
 
-void Preferences::setPropCurTab(const int &tab)
+void Preferences::setPropCurTab(const int tab)
 {
     setValue("TorrentProperties/CurrentTab", tab);
 }
@@ -1356,7 +1356,7 @@ int Preferences::getTransSelFilter() const
     return value("TransferListFilters/selectedFilterIndex", 0).toInt();
 }
 
-void Preferences::setTransSelFilter(const int &index)
+void Preferences::setTransSelFilter(const int index)
 {
     setValue("TransferListFilters/selectedFilterIndex", index);
 }
diff --git a/src/base/preferences.h b/src/base/preferences.h
index d80eaf19b..305b4c85f 100644
--- a/src/base/preferences.h
+++ b/src/base/preferences.h
@@ -303,7 +303,7 @@ public:
     QString getDNSLastIP() const;
     void setDNSLastIP(const QString &ip);
     bool getAcceptedLegal() const;
-    void setAcceptedLegal(const bool accepted);
+    void setAcceptedLegal(bool accepted);
     QByteArray getMainGeometry() const;
     void setMainGeometry(const QByteArray &geometry);
     QByteArray getMainVSplitterState() const;
@@ -321,9 +321,9 @@ public:
     QByteArray getPropFileListState() const;
     void setPropFileListState(const QByteArray &state);
     int getPropCurTab() const;
-    void setPropCurTab(const int &tab);
+    void setPropCurTab(int tab);
     bool getPropVisible() const;
-    void setPropVisible(const bool visible);
+    void setPropVisible(bool visible);
     QByteArray getPropTrackerListState() const;
     void setPropTrackerListState(const QByteArray &state);
     QSize getRssGeometrySize() const;
@@ -351,17 +351,17 @@ public:
     bool getTagFilterState() const;
     bool getTrackerFilterState() const;
     int getTransSelFilter() const;
-    void setTransSelFilter(const int &index);
+    void setTransSelFilter(int index);
     QByteArray getTransHeaderState() const;
     void setTransHeaderState(const QByteArray &state);
     bool getRegexAsFilteringPatternForTransferList() const;
     void setRegexAsFilteringPatternForTransferList(bool checked);
     int getToolbarTextPosition() const;
-    void setToolbarTextPosition(const int position);
+    void setToolbarTextPosition(int position);
 
     // From old RssSettings class
     bool isRSSWidgetEnabled() const;
-    void setRSSWidgetVisible(const bool enabled);
+    void setRSSWidgetVisible(bool enabled);
 
     // Network
     QList<QNetworkCookie> getNetworkCookies() const;
@@ -371,9 +371,9 @@ public:
     bool isSpeedWidgetEnabled() const;
     void setSpeedWidgetEnabled(bool enabled);
     int getSpeedWidgetPeriod() const;
-    void setSpeedWidgetPeriod(const int period);
+    void setSpeedWidgetPeriod(int period);
     bool getSpeedWidgetGraphEnable(int id) const;
-    void setSpeedWidgetGraphEnable(int id, const bool enable);
+    void setSpeedWidgetGraphEnable(int id, bool enable);
 
 public slots:
     void setStatusFilterState(bool checked);
diff --git a/src/base/scanfoldersmodel.h b/src/base/scanfoldersmodel.h
index 9b77d9e37..e590fcd32 100644
--- a/src/base/scanfoldersmodel.h
+++ b/src/base/scanfoldersmodel.h
@@ -68,7 +68,7 @@ public:
     static void freeInstance();
     static ScanFoldersModel *instance();
 
-    static QString pathTypeDisplayName(const PathType type);
+    static QString pathTypeDisplayName(PathType type);
 
     int rowCount(const QModelIndex &parent = QModelIndex()) const;
     int columnCount(const QModelIndex &parent = QModelIndex()) const;
diff --git a/src/base/torrentfilter.h b/src/base/torrentfilter.h
index c4012f75d..350e3f7a7 100644
--- a/src/base/torrentfilter.h
+++ b/src/base/torrentfilter.h
@@ -72,7 +72,7 @@ public:
     TorrentFilter();
     // category & tags: pass empty string for uncategorized / untagged torrents.
     // Pass null string (QString()) to disable filtering (i.e. all torrents).
-    TorrentFilter(const Type type, const QStringSet &hashSet = AnyHash, const QString &category = AnyCategory, const QString &tag = AnyTag);
+    TorrentFilter(Type type, const QStringSet &hashSet = AnyHash, const QString &category = AnyCategory, const QString &tag = AnyTag);
     TorrentFilter(const QString &filter, const QStringSet &hashSet = AnyHash, const QString &category = AnyCategory, const QString &tags = AnyTag);
 
     bool setType(Type type);
diff --git a/src/base/utils/bytearray.h b/src/base/utils/bytearray.h
index e0f46abf3..a9e6e89ea 100644
--- a/src/base/utils/bytearray.h
+++ b/src/base/utils/bytearray.h
@@ -40,6 +40,6 @@ namespace Utils
 
         // Mimic QByteArray::mid(pos, len) but instead of returning a full-copy,
         // we only return a partial view
-        const QByteArray midView(const QByteArray &in, const int pos, const int len = -1);
+        const QByteArray midView(const QByteArray &in, int pos, int len = -1);
     }
 }
diff --git a/src/base/utils/random.h b/src/base/utils/random.h
index 6e3a30c0e..93448191a 100644
--- a/src/base/utils/random.h
+++ b/src/base/utils/random.h
@@ -35,7 +35,7 @@ namespace Utils
 {
     namespace Random
     {
-        uint32_t rand(const uint32_t min = 0, const uint32_t max = UINT32_MAX);
+        uint32_t rand(uint32_t min = 0, uint32_t max = UINT32_MAX);
     }
 }
 
diff --git a/src/base/utils/string.h b/src/base/utils/string.h
index d90640919..c5cf43c78 100644
--- a/src/base/utils/string.h
+++ b/src/base/utils/string.h
@@ -63,7 +63,7 @@ namespace Utils
             return str;
         }
 
-        bool parseBool(const QString &string, const bool defaultValue);
+        bool parseBool(const QString &string, bool defaultValue);
         TriStateBool parseTriStateBool(const QString &string);
     }
 }
diff --git a/src/gui/mainwindow.h b/src/gui/mainwindow.h
index 52168ad5e..b40322519 100644
--- a/src/gui/mainwindow.h
+++ b/src/gui/mainwindow.h
@@ -84,7 +84,7 @@ public:
     bool isExecutionLogEnabled() const;
     void setExecutionLogEnabled(bool value);
     int executionLogMsgTypes() const;
-    void setExecutionLogMsgTypes(const int value);
+    void setExecutionLogMsgTypes(int value);
 
     // Notifications properties
     bool isNotificationsEnabled() const;
diff --git a/src/gui/transferlistsortmodel.h b/src/gui/transferlistsortmodel.h
index e8581b136..b5355f9e9 100644
--- a/src/gui/transferlistsortmodel.h
+++ b/src/gui/transferlistsortmodel.h
@@ -52,7 +52,7 @@ public:
 private:
     bool lessThan(const QModelIndex &left, const QModelIndex &right) const override;
     bool lowerPositionThan(const QModelIndex &left, const QModelIndex &right) const;
-    bool dateLessThan(const int dateColumn, const QModelIndex &left, const QModelIndex &right, bool sortInvalidInBottom) const;
+    bool dateLessThan(int dateColumn, const QModelIndex &left, const QModelIndex &right, bool sortInvalidInBottom) const;
     bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override;
     bool matchFilter(int sourceRow, const QModelIndex &sourceParent) const;
 
diff --git a/src/gui/utils.h b/src/gui/utils.h
index 35502abe3..ee1c7e76d 100644
--- a/src/gui/utils.h
+++ b/src/gui/utils.h
@@ -49,9 +49,9 @@ namespace Utils
             return (size * screenScalingFactor(widget));
         }
 
-        QPixmap scaledPixmap(const QIcon &icon, const QWidget *widget, const int height);
-        QPixmap scaledPixmap(const QString &path, const QWidget *widget, const int height = 0);
-        QPixmap scaledPixmapSvg(const QString &path, const QWidget *widget, const int baseHeight);
+        QPixmap scaledPixmap(const QIcon &icon, const QWidget *widget, int height);
+        QPixmap scaledPixmap(const QString &path, const QWidget *widget, int height = 0);
+        QPixmap scaledPixmapSvg(const QString &path, const QWidget *widget, int baseHeight);
         QSize smallIconSize(const QWidget *widget = nullptr);
         QSize mediumIconSize(const QWidget *widget = nullptr);
         QSize largeIconSize(const QWidget *widget = nullptr);
diff --git a/src/webui/api/searchcontroller.h b/src/webui/api/searchcontroller.h
index 9f3fcd7d9..38cdc40f5 100644
--- a/src/webui/api/searchcontroller.h
+++ b/src/webui/api/searchcontroller.h
@@ -66,8 +66,8 @@ private:
 
     void checkForUpdatesFinished(const QHash<QString, PluginVersion> &updateInfo);
     void checkForUpdatesFailed(const QString &reason);
-    void searchFinished(ISession *session, const int id);
-    void searchFailed(ISession *session, const int id);
+    void searchFinished(ISession *session, int id);
+    void searchFailed(ISession *session, int id);
     int generateSearchId() const;
     QJsonObject getResults(const QList<SearchResult> &searchResults, bool isSearchActive, int totalResults) const;
     QJsonArray getPluginsInfo(const QStringList &plugins) const;