diff --git a/lib/hooks/average.c b/lib/hooks/average.c
index 340fe0096..338c03005 100644
--- a/lib/hooks/average.c
+++ b/lib/hooks/average.c
@@ -32,7 +32,6 @@
 #include <villas/bitset.h>
 
 struct average {
-	uint64_t mask;
 	int offset;
 
 	struct bitset mask;