3 files changed, 5 insertions, 5 deletions
diff --git a/src/plugins/Visual/projectm/projectmwidget.h b/src/plugins/Visual/projectm/projectmwidget.h
index 7dbdc2594..d67742a07 100644
--- a/src/plugins/Visual/projectm/projectmwidget.h
+++ b/src/plugins/Visual/projectm/projectmwidget.h
@@ -35,7 +35,7 @@ class ProjectMWidget : public QOpenGLWidget
 {
     Q_OBJECT
 public:
-    ProjectMWidget(QListWidget *listWidget, QWidget *parent = nullptr);
+    explicit ProjectMWidget(QListWidget *listWidget, QWidget *parent = nullptr);
 
     ~ProjectMWidget();
 
diff --git a/src/plugins/Visual/projectm/projectmwrapper.cpp b/src/plugins/Visual/projectm/projectmwrapper.cpp
index 5078cffe2..16449a432 100644
--- a/src/plugins/Visual/projectm/projectmwrapper.cpp
+++ b/src/plugins/Visual/projectm/projectmwrapper.cpp
@@ -20,12 +20,12 @@
 
 #include "projectmwrapper.h"
 
-ProjectMWrapper::ProjectMWrapper(std::string config_file, int flags, QObject *parent) :
+ProjectMWrapper::ProjectMWrapper(const std::string &config_file, int flags, QObject *parent) :
     QObject(parent), projectM(config_file, flags)
 {
 }
 
-ProjectMWrapper::ProjectMWrapper(projectM::Settings settings, int flags, QObject *parent) :
+ProjectMWrapper::ProjectMWrapper(const projectM::Settings &settings, int flags, QObject *parent) :
     QObject(parent), projectM(settings, flags)
 {
 }
diff --git a/src/plugins/Visual/projectm/projectmwrapper.h b/src/plugins/Visual/projectm/projectmwrapper.h
index 99b226ac7..fead927ed 100644
--- a/src/plugins/Visual/projectm/projectmwrapper.h
+++ b/src/plugins/Visual/projectm/projectmwrapper.h
@@ -28,8 +28,8 @@ class ProjectMWrapper : public QObject, public projectM
 {
     Q_OBJECT
 public:
-    explicit ProjectMWrapper(std::string config_file, int flags, QObject *parent = nullptr);
-    explicit ProjectMWrapper(Settings settings, int flags, QObject *parent = nullptr);
+    explicit ProjectMWrapper(const std::string &config_file, int flags, QObject *parent = nullptr);
+    explicit ProjectMWrapper(const Settings &settings, int flags, QObject *parent = nullptr);
 
     virtual ~ProjectMWrapper();