diff --git a/src/LFO.cpp b/src/LFO.cpp
index 9a6b2c3..c3f2248 100644
--- a/src/LFO.cpp
+++ b/src/LFO.cpp
@@ -181,7 +181,7 @@ struct LFO2 : Module {
 	float lights[1] = {};
 
 	LFO2() : Module(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS) {}
-	void step();
+	void step() override;
 };