diff --git a/benchmark/centos6/pgroonga.sh b/benchmark/centos6/pgroonga.sh
index 7c2ae1b..4508030 100755
--- a/benchmark/centos6/pgroonga.sh
+++ b/benchmark/centos6/pgroonga.sh
@@ -2,7 +2,7 @@
 
 set -u
 
-n_tries=3
+n_tries=1
 
 script_dir=$(cd "$(dirname $0)"; pwd)
 base_dir="${script_dir}/../.."