diff --git a/src/chasers/chaser_validate.cpp b/src/chasers/chaser_validate.cpp
index 4c5eab9d..fbc1b592 100644
--- a/src/chasers/chaser_validate.cpp
+++ b/src/chasers/chaser_validate.cpp
@@ -57,7 +57,7 @@ code chaser_validate::start() NOEXCEPT
 }
 
 bool chaser_validate::handle_event(const code&, chase event_,
-    event_value value) NOEXCEPT
+    event_value) NOEXCEPT
 {
     if (closed())
         return false;