diff --git a/src/test/recovery/t/031_recovery_conflict.pl b/src/test/recovery/t/031_recovery_conflict.pl
index 6bc209bba04..e9819a900f3 100644
--- a/src/test/recovery/t/031_recovery_conflict.pl
+++ b/src/test/recovery/t/031_recovery_conflict.pl
@@ -22,6 +22,9 @@ $node_primary->append_conf(
 allow_in_place_tablespaces = on
 log_temp_files = 0
 
+# The test must control when pruning WAL is generated.
+autovacuum = off
+
 # for deadlock test
 max_prepared_transactions = 10