diff --git a/src/backend/slony1_funcs.sql b/src/backend/slony1_funcs.sql
index 7c083db..692d3ff 100644
--- a/src/backend/slony1_funcs.sql
+++ b/src/backend/slony1_funcs.sql
@@ -5540,7 +5540,8 @@ $$
 		end if;
 		return NULL;
     end
-$$ language plpgsql;
+$$ language plpgsql
+    security definer;
 
 comment on function @NAMESPACE@.log_truncate ()
 is 'trigger function run when a replicated table receives a TRUNCATE request';