diff --git a/libraries/audio-client/src/AudioClient.cpp b/libraries/audio-client/src/AudioClient.cpp
index f1a69441f1..3d9b1de10f 100644
--- a/libraries/audio-client/src/AudioClient.cpp
+++ b/libraries/audio-client/src/AudioClient.cpp
@@ -1278,7 +1278,7 @@ bool AudioClient::mixLocalAudioInjectors(float* mixBuffer) {
         }
     }
 
-    for (AudioInjectorPointer injector : injectorsToRemove) {
+    for (const AudioInjectorPointer& injector : injectorsToRemove) {
         qCDebug(audioclient) << "removing injector";
         _activeLocalAudioInjectors.removeOne(injector);
     }
@@ -1369,7 +1369,7 @@ void AudioClient::setIsStereoInput(bool isStereoInput) {
     }
 }
 
-bool AudioClient::outputLocalInjector(AudioInjectorPointer injector) {
+bool AudioClient::outputLocalInjector(const AudioInjectorPointer& injector) {
     AudioInjectorLocalBuffer* injectorBuffer = injector->getLocalBuffer();
     if (injectorBuffer) {
         // local injectors are on the AudioInjectorsThread, so we must guard access
diff --git a/libraries/audio-client/src/AudioClient.h b/libraries/audio-client/src/AudioClient.h
index 7fbfcc25d6..31e36671c7 100644
--- a/libraries/audio-client/src/AudioClient.h
+++ b/libraries/audio-client/src/AudioClient.h
@@ -143,7 +143,7 @@ public:
 
     Q_INVOKABLE void setAvatarBoundingBoxParameters(glm::vec3 corner, glm::vec3 scale);
 
-    bool outputLocalInjector(AudioInjectorPointer injector) override;
+    bool outputLocalInjector(const AudioInjectorPointer& injector) override;
 
     QAudioDeviceInfo getActiveAudioDevice(QAudio::Mode mode) const;
     QList<QAudioDeviceInfo> getAudioDevices(QAudio::Mode mode) const;
diff --git a/libraries/audio/src/AbstractAudioInterface.h b/libraries/audio/src/AbstractAudioInterface.h
index 314884a67a..8b48b55206 100644
--- a/libraries/audio/src/AbstractAudioInterface.h
+++ b/libraries/audio/src/AbstractAudioInterface.h
@@ -36,7 +36,7 @@ public:
     // threadsafe
     // moves injector->getLocalBuffer() to another thread (so removes its parent)
     // take care to delete it when ~AudioInjector, as parenting Qt semantics will not work
-    virtual bool outputLocalInjector(AudioInjectorPointer injector) = 0;
+    virtual bool outputLocalInjector(const AudioInjectorPointer& injector) = 0;
 
 public slots:
     virtual bool shouldLoopbackInjectors() { return false; }
diff --git a/libraries/script-engine/src/ScriptAudioInjector.cpp b/libraries/script-engine/src/ScriptAudioInjector.cpp
index 37a9ad65d7..1b734e8cdf 100644
--- a/libraries/script-engine/src/ScriptAudioInjector.cpp
+++ b/libraries/script-engine/src/ScriptAudioInjector.cpp
@@ -29,7 +29,7 @@ void injectorFromScriptValue(const QScriptValue& object, ScriptAudioInjector*& o
     out = qobject_cast<ScriptAudioInjector*>(object.toQObject());
 }
 
-ScriptAudioInjector::ScriptAudioInjector(AudioInjectorPointer injector) :
+ScriptAudioInjector::ScriptAudioInjector(const AudioInjectorPointer& injector) :
     _injector(injector)
 {
     QObject::connect(injector.data(), &AudioInjector::finished, this, &ScriptAudioInjector::finished);
diff --git a/libraries/script-engine/src/ScriptAudioInjector.h b/libraries/script-engine/src/ScriptAudioInjector.h
index 018fbe5110..4c2871dd34 100644
--- a/libraries/script-engine/src/ScriptAudioInjector.h
+++ b/libraries/script-engine/src/ScriptAudioInjector.h
@@ -23,7 +23,7 @@ class ScriptAudioInjector : public QObject {
     Q_PROPERTY(float loudness READ getLoudness)
     Q_PROPERTY(AudioInjectorOptions options WRITE setOptions READ getOptions)
 public:
-    ScriptAudioInjector(AudioInjectorPointer injector);
+    ScriptAudioInjector(const AudioInjectorPointer& injector);
     ~ScriptAudioInjector();
 public slots:
     void restart() { _injector->restart(); }