diff --git a/rsocket-transports/ktor-tcp/src/commonTest/kotlin/io/rsocket/kotlin/transport/ktor/tcp/TcpServerTest.kt b/rsocket-transports/ktor-tcp/src/commonTest/kotlin/io/rsocket/kotlin/transport/ktor/tcp/TcpServerTest.kt
index 732768b7..005f7811 100644
--- a/rsocket-transports/ktor-tcp/src/commonTest/kotlin/io/rsocket/kotlin/transport/ktor/tcp/TcpServerTest.kt
+++ b/rsocket-transports/ktor-tcp/src/commonTest/kotlin/io/rsocket/kotlin/transport/ktor/tcp/TcpServerTest.kt
@@ -25,7 +25,7 @@ import kotlin.test.*
 class TcpServerTest : SuspendTest {
     private val testJob = Job()
     private val testContext = testJob + TestExceptionHandler
-    private val serverTransport = KtorTcpServerTransport(testContext).target()
+    private val serverTransport = KtorTcpServerTransport(testContext).target("127.0.0.1")
     private fun KtorTcpServerInstance.clientTransport() =
         KtorTcpClientTransport(testContext).target(localAddress)
 
diff --git a/rsocket-transports/ktor-tcp/src/commonTest/kotlin/io/rsocket/kotlin/transport/ktor/tcp/TcpTransportTest.kt b/rsocket-transports/ktor-tcp/src/commonTest/kotlin/io/rsocket/kotlin/transport/ktor/tcp/TcpTransportTest.kt
index 72682ce3..1b2e9e1a 100644
--- a/rsocket-transports/ktor-tcp/src/commonTest/kotlin/io/rsocket/kotlin/transport/ktor/tcp/TcpTransportTest.kt
+++ b/rsocket-transports/ktor-tcp/src/commonTest/kotlin/io/rsocket/kotlin/transport/ktor/tcp/TcpTransportTest.kt
@@ -24,7 +24,7 @@ import kotlinx.coroutines.*
 @Suppress("DEPRECATION_ERROR")
 class TcpTransportTest : TransportTest() {
     override suspend fun before() {
-        val serverSocket = startServer(TcpServerTransport()).serverSocket.await()
+        val serverSocket = startServer(TcpServerTransport("127.0.0.1")).serverSocket.await()
         client = connectClient(TcpClientTransport(serverSocket.localAddress as InetSocketAddress, testContext))
     }
 }
@@ -36,7 +36,7 @@ class KtorTcpTransportTest : TransportTest() {
     override suspend fun before() {
         val server = startServer(KtorTcpServerTransport(testContext) {
             selectorManager(selector, false)
-        }.target())
+        }.target("127.0.0.1"))
         client = connectClient(KtorTcpClientTransport(testContext) {
             selectorManager(selector, false)
         }.target(server.localAddress))