diff --git a/ci/test_integration_espnet2.sh b/ci/test_integration_espnet2.sh
index 46fd908ea0f..c4984292276 100755
--- a/ci/test_integration_espnet2.sh
+++ b/ci/test_integration_espnet2.sh
@@ -116,17 +116,17 @@ for t in ${feats_types}; do
     for t2 in ${token_types}; do
         echo "==== feats_type=${t}, token_types=${t2} ==="
         ./run.sh --ngpu 0 --stage 6 --stop-stage 13 --skip-upload false --feats-type "${t}" --tgt_token_type "${t2}" --src_token_type "${t2}" \
-            --st-args "--max_epoch=1" --lm-args "--max_epoch=1" --inference_args "--beam_size 5" --python "${python}"
+            --st-args "--max_epoch=1" --lm-args "--max_epoch=1" --inference_args "--beam_size 1" --python "${python}"
     done
 done
 echo "==== feats_type=raw, token_types=bpe, model_conf.extract_feats_in_collect_stats=False, normalize=utt_mvn ==="
 ./run.sh --ngpu 0 --stage 10 --stop-stage 13 --skip-upload false --feats-type "raw" --tgt_token_type "bpe" --src_token_type "bpe" \
-    --feats_normalize "utterance_mvn" --lm-args "--max_epoch=1" --inference_args "--beam_size 5" --python "${python}" \
+    --feats_normalize "utterance_mvn" --lm-args "--max_epoch=1" --inference_args "--beam_size 1" --python "${python}" \
     --st-args "--model_conf extract_feats_in_collect_stats=false --max_epoch=1"
 
 echo "==== use_streaming, feats_type=raw, token_types=bpe, model_conf.extract_feats_in_collect_stats=False, normalize=utt_mvn ==="
 ./run.sh --use_streaming true --ngpu 0 --stage 6 --stop-stage 13 --skip-upload false --feats-type "raw" --tgt_token_type "bpe" --src_token_type "bpe" \
-    --feats_normalize "utterance_mvn" --lm-args "--max_epoch=1" --inference_args "--beam_size 5" --python "${python}" \
+    --feats_normalize "utterance_mvn" --lm-args "--max_epoch=1" --inference_args "--beam_size 1" --python "${python}" \
     --st-args "--model_conf extract_feats_in_collect_stats=false --max_epoch=1 --encoder=contextual_block_transformer --decoder=transformer
                 --encoder_conf block_size=40 --encoder_conf hop_size=16 --encoder_conf look_ahead=16"