diff --git a/src/controllers/midi/hss1394controller.cpp b/src/controllers/midi/hss1394controller.cpp
index fb6efda3e4f..95fd45ab676 100644
--- a/src/controllers/midi/hss1394controller.cpp
+++ b/src/controllers/midi/hss1394controller.cpp
@@ -59,8 +59,7 @@ void DeviceChannelListener::Reconnected() {
 
 Hss1394Controller::Hss1394Controller(
         const hss1394::TNodeInfo& deviceInfo,
-        int deviceIndex,
-        UserSettingsPointer pConfig)
+        int deviceIndex)
         : MidiController(),
           m_deviceInfo(deviceInfo),
           m_iDeviceIndex(deviceIndex) {
diff --git a/src/controllers/midi/hss1394controller.h b/src/controllers/midi/hss1394controller.h
index 1f1cbf57e55..cbf6929eb52 100644
--- a/src/controllers/midi/hss1394controller.h
+++ b/src/controllers/midi/hss1394controller.h
@@ -39,8 +39,7 @@ class Hss1394Controller : public MidiController {
   public:
     Hss1394Controller(
             const hss1394::TNodeInfo& deviceInfo,
-            int deviceIndex,
-            UserSettingsPointer pConfig);
+            int deviceIndex);
     ~Hss1394Controller() override;
 
   private slots:
diff --git a/src/controllers/midi/hss1394enumerator.cpp b/src/controllers/midi/hss1394enumerator.cpp
index 76a120c9701..d8a4d539972 100644
--- a/src/controllers/midi/hss1394enumerator.cpp
+++ b/src/controllers/midi/hss1394enumerator.cpp
@@ -41,7 +41,7 @@ QList<Controller*> Hss1394Enumerator::queryDevices() {
                          QString("%1").arg(tNodeInfo.uProtocolVersion, 0, 16));
             qDebug() << " " << message;
             Hss1394Controller* currentDevice = new Hss1394Controller(
-                    tNodeInfo, i, m_pConfig);
+                    tNodeInfo, i);
             m_devices.push_back(currentDevice);
         }
     }
diff --git a/src/encoder/encoderopus.cpp b/src/encoder/encoderopus.cpp
index d8e2632d9d0..46fa95d8934 100644
--- a/src/encoder/encoderopus.cpp
+++ b/src/encoder/encoderopus.cpp
@@ -287,7 +287,7 @@ void EncoderOpus::pushTagsPacket() {
     int commentCount = 0;
 
     const char* vendorString = opus_get_version_string();
-    int vendorStringLength = strlen(vendorString);
+    int vendorStringLength = static_cast<int>(strlen(vendorString));
 
     // == Compute tags frame size ==
     // - Magic signature: 8 bytes
diff --git a/src/engine/sync/synccontrol.cpp b/src/engine/sync/synccontrol.cpp
index e01f75640f5..5762a03dd79 100644
--- a/src/engine/sync/synccontrol.cpp
+++ b/src/engine/sync/synccontrol.cpp
@@ -474,7 +474,7 @@ void SyncControl::updateAudible() {
     if (channelIndex >= 0) {
         CSAMPLE_GAIN gain = getEngineMaster()->getMasterGain(channelIndex);
         bool newAudible = gain > CSAMPLE_GAIN_ZERO;
-        if (m_audible != newAudible) {
+        if (static_cast<bool>(m_audible) != newAudible) {
             m_audible = newAudible;
             m_pEngineSync->notifyPlayingAudible(this, m_pPlayButton->toBool() && m_audible);
         }
diff --git a/src/library/export/dlglibraryexport.cpp b/src/library/export/dlglibraryexport.cpp
index ded3eac4f6b..9b0e6eff5f6 100644
--- a/src/library/export/dlglibraryexport.cpp
+++ b/src/library/export/dlglibraryexport.cpp
@@ -273,6 +273,7 @@ void DlgLibraryExport::checkExistingDatabase() {
         }
 
     } catch (std::exception& e) {
+        Q_UNUSED(e);
         m_pExistingDatabaseLabel->setText(
                 tr("A database already exists in the chosen directory, "
                    "but there was a problem loading it. Export is not "
diff --git a/src/widget/wtracktableviewheader.cpp b/src/widget/wtracktableviewheader.cpp
index a79ecc30530..fae519c629e 100644
--- a/src/widget/wtracktableviewheader.cpp
+++ b/src/widget/wtracktableviewheader.cpp
@@ -49,7 +49,7 @@ HeaderViewState::HeaderViewState(const QString& base64serialized) {
 QString HeaderViewState::saveState() const {
     // Serialize the proto to a byte array, then encode the array as Base64.
 #if GOOGLE_PROTOBUF_VERSION >= 3001000
-    size_t size = m_view_state.ByteSizeLong();
+    int size = static_cast<int>(m_view_state.ByteSizeLong());
 #else
     int size = m_view_state.ByteSize();
 #endif