diff --git a/src/filter.c b/src/filter.c
index b01b68ab..e615deb1 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -96,7 +96,6 @@ struct pointer_tracker {
 	int dir;
 };
 
-struct pointer_accelerator;
 struct pointer_accelerator {
 	struct motion_filter base;