diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/generic/GenericIngressSubscription.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/generic/GenericIngressSubscription.kt
index c58c6eb6c..4dbd83901 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/generic/GenericIngressSubscription.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/generic/GenericIngressSubscription.kt
@@ -38,7 +38,7 @@ class GenericSubscriptionConnect(
 
     @Suppress("UNCHECKED_CAST")
     override fun createConnection(): Flux<Any> {
-        return conn.subscribe(ChainRequest(topic, ListParams(getParams(params))))
+        return conn.subscribe(ChainRequest(topic, ListParams(getParams(params) as List<Any>)))
             .data
             .timeout(Duration.ofSeconds(60), Mono.empty())
             .onErrorResume { Mono.empty() } as Flux<Any>
diff --git a/src/test/kotlin/io/emeraldpay/dshackle/upstream/generic/GenericSubscriptionConnectTest.kt b/src/test/kotlin/io/emeraldpay/dshackle/upstream/generic/GenericSubscriptionConnectTest.kt
new file mode 100644
index 000000000..db8e36f26
--- /dev/null
+++ b/src/test/kotlin/io/emeraldpay/dshackle/upstream/generic/GenericSubscriptionConnectTest.kt
@@ -0,0 +1,36 @@
+package io.emeraldpay.dshackle.upstream.generic
+
+import io.emeraldpay.dshackle.upstream.ChainRequest
+import io.emeraldpay.dshackle.upstream.ethereum.WsSubscriptions
+import io.emeraldpay.dshackle.upstream.rpcclient.ListParams
+import org.junit.jupiter.api.Test
+import org.mockito.Mockito.verify
+import org.mockito.kotlin.doReturn
+import org.mockito.kotlin.mock
+import reactor.core.publisher.Flux
+import reactor.test.StepVerifier
+import java.time.Duration
+import java.util.concurrent.atomic.AtomicReference
+
+class GenericSubscriptionConnectTest {
+
+    @Test
+    fun `test request param is flat list`() {
+        val param: List<Any> = listOf("all")
+        val topic = "topic"
+        val response = "hello".toByteArray()
+        val ws = mock<WsSubscriptions> {
+            on { subscribe(ChainRequest(topic, ListParams(param))) } doReturn
+                WsSubscriptions.SubscribeData(Flux.just(response), "", AtomicReference(""))
+        }
+
+        val genericSubscriptionConnect = GenericSubscriptionConnect(ws, topic, param)
+
+        StepVerifier.create(genericSubscriptionConnect.createConnection())
+            .expectNext(response)
+            .expectComplete()
+            .verify(Duration.ofSeconds(1))
+
+        verify(ws).subscribe(ChainRequest(topic, ListParams(param)))
+    }
+}