diff --git a/src/ipa/rpi/common/ipa_base.h b/src/ipa/rpi/common/ipa_base.h
index a95cda1f..1a811beb 100644
--- a/src/ipa/rpi/common/ipa_base.h
+++ b/src/ipa/rpi/common/ipa_base.h
@@ -49,7 +49,7 @@ public:
 	void processStats(const ProcessParams &params) override;
 
 protected:
-	bool monoSensor()
+	bool monoSensor() const
 	{
 		return monoSensor_;
 	}