diff --git a/libs/ardour/amp.cc b/libs/ardour/amp.cc
index 28f8729436..880fe2575e 100644
--- a/libs/ardour/amp.cc
+++ b/libs/ardour/amp.cc
@@ -42,7 +42,7 @@ Amp::Amp (Session& s, std::string type)
 	: Processor(s, "Amp")
 	, _apply_gain(true)
 	, _apply_gain_automation(false)
-	, _current_gain(GAIN_COEFF_UNITY)
+	, _current_gain(GAIN_COEFF_ZERO)
 	, _current_automation_frame (INT64_MAX)
 	, _gain_automation_buffer(0)
 	, _type (type)