diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/other/SnowflakeIdGenerateService.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/other/SnowflakeIdGenerateService.kt
index 3b82b1cc..26f3564b 100644
--- a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/other/SnowflakeIdGenerateService.kt
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/infrastructure/other/SnowflakeIdGenerateService.kt
@@ -24,9 +24,9 @@ import java.time.Instant
 
 @Suppress("MagicNumber")
 open class SnowflakeIdGenerateService(private val baseTime: Long) : IdGenerateService {
-    var lastTimeStamp: Long = -1
-    var sequenceId: Int = 0
-    val mutex = Mutex()
+    private var lastTimeStamp: Long = -1
+    private var sequenceId: Long = 0
+    private val mutex = Mutex()
 
     @Throws(IllegalStateException::class)
     override suspend fun generateId(): Long {
@@ -34,7 +34,6 @@ open class SnowflakeIdGenerateService(private val baseTime: Long) : IdGenerateSe
             var timestamp = getTime()
             if (timestamp < lastTimeStamp) {
                 timestamp = wait(timestamp)
-                //            throw IllegalStateException(" $lastTimeStamp $timestamp ${lastTimeStamp-timestamp}  ")
             }
             if (timestamp == lastTimeStamp) {
                 sequenceId++
@@ -46,7 +45,7 @@ open class SnowflakeIdGenerateService(private val baseTime: Long) : IdGenerateSe
                 sequenceId = 0
             }
             lastTimeStamp = timestamp
-            return@withLock (timestamp - baseTime).shl(22).or(1L.shl(12)).or(sequenceId.toLong())
+            return@withLock (timestamp - baseTime).shl(22).or(1L.shl(12)).or(sequenceId)
         }
     }
 
@@ -77,8 +76,10 @@ open class SnowflakeIdGenerateService(private val baseTime: Long) : IdGenerateSe
     override fun hashCode(): Int {
         var result = baseTime.hashCode()
         result = 31 * result + lastTimeStamp.hashCode()
-        result = 31 * result + sequenceId
+        result = 31 * result + sequenceId.hashCode()
         result = 31 * result + mutex.hashCode()
         return result
     }
+
+
 }
diff --git a/hideout-core/src/test/kotlin/dev/usbharu/hideout/core/infrastructure/other/TwitterSnowflakeIdGenerateServiceTest.kt b/hideout-core/src/test/kotlin/dev/usbharu/hideout/core/infrastructure/other/TwitterSnowflakeIdGenerateServiceTest.kt
index 98855ca8..0c7cb432 100644
--- a/hideout-core/src/test/kotlin/dev/usbharu/hideout/core/infrastructure/other/TwitterSnowflakeIdGenerateServiceTest.kt
+++ b/hideout-core/src/test/kotlin/dev/usbharu/hideout/core/infrastructure/other/TwitterSnowflakeIdGenerateServiceTest.kt
@@ -1,28 +1,22 @@
 package dev.usbharu.hideout.core.infrastructure.other
 
-import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.coroutineScope
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
-import kotlinx.coroutines.sync.Mutex
-import kotlinx.coroutines.sync.withLock
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
 
 class TwitterSnowflakeIdGenerateServiceTest {
     @Test
     fun noDuplicateTest() = runBlocking {
-        val mutex = Mutex()
-        val mutableListOf = mutableListOf<Long>()
-        coroutineScope {
-            repeat(500000) {
-                launch(Dispatchers.IO) {
-                    val id = TwitterSnowflakeIdGenerateService.generateId()
-                    mutex.withLock {
-                        mutableListOf.add(id)
-                    }
+
+        val mutableListOf = coroutineScope {
+            (1..10000).map {
+                async {
+                    TwitterSnowflakeIdGenerateService.generateId()
                 }
-            }
+            }.awaitAll()
         }
 
         assertEquals(0, mutableListOf.size - mutableListOf.toSet().size)