diff --git a/ext/datadog_cov/datadog_cov.c b/ext/datadog_cov/datadog_cov.c
index ed020e86..9e8cbb8a 100644
--- a/ext/datadog_cov/datadog_cov.c
+++ b/ext/datadog_cov/datadog_cov.c
@@ -194,9 +194,6 @@ static VALUE dd_cov_start(VALUE self)
     rb_add_event_hook(dd_cov_update_coverage, RUBY_EVENT_LINE, self);
   }
 
-  // add event hook
-  rb_thread_add_event_hook(thval, dd_cov_update_coverage, RUBY_EVENT_LINE, self);
-
   return self;
 }