1 files changed, 1 insertions, 1 deletions
diff --git a/src/control/controleffectknob.h b/src/control/controleffectknob.h
index eabb38e07b..b0a10e2ae8 100644
--- a/src/control/controleffectknob.h
+++ b/src/control/controleffectknob.h
@@ -7,7 +7,7 @@
 class ControlEffectKnob : public ControlPotmeter {
     Q_OBJECT
   public:
-    ControlEffectKnob(ConfigKey key, double dMinValue = 0.0, double dMaxValue = 1.0);
+    ControlEffectKnob(const ConfigKey& key, double dMinValue = 0.0, double dMaxValue = 1.0);
 
     void setBehaviour(EffectManifestParameter::ControlHint type,
             double dMinValue, double dMaxValue);