diff --git a/src/test/modules/test_misc/t/006_signal_autovacuum.pl b/src/test/modules/test_misc/t/006_signal_autovacuum.pl
index aaea569c101..04b06bfc2ad 100644
--- a/src/test/modules/test_misc/t/006_signal_autovacuum.pl
+++ b/src/test/modules/test_misc/t/006_signal_autovacuum.pl
@@ -7,7 +7,7 @@
 # at the beginning of the autovacuum worker startup.
 
 use strict;
-use warnings;
+use warnings FATAL => 'all';
 use PostgreSQL::Test::Cluster;
 use Test::More;