diff --git a/src/main/java/io/wring/agents/Routine.java b/src/main/java/io/wring/agents/Routine.java
index 7b6d16a..170fde9 100644
--- a/src/main/java/io/wring/agents/Routine.java
+++ b/src/main/java/io/wring/agents/Routine.java
@@ -96,8 +96,8 @@ public Routine(final Base bse) {
     public Routine(final Base bse, final int total) {
         this.base = bse;
         this.threads = total;
-        this.executor = Executors.newScheduledThreadPool(
-            total, new VerboseThreads(Routine.class)
+        this.executor = Executors.newSingleThreadScheduledExecutor(
+            new VerboseThreads(Routine.class)
         );
     }