diff --git a/src/amplifier.c b/src/amplifier.c
index c56364e0c..c6e05694e 100644
--- a/src/amplifier.c
+++ b/src/amplifier.c
@@ -103,7 +103,7 @@ static int add_opened_amp(AMP *amp)
 }
 
 
-static int remove_opened_amp(AMP *amp)
+static int remove_opened_amp(const AMP *amp)
 {
     struct opened_amp_l *p, *q;
     q = NULL;