diff --git a/rsocket-core/src/commonTest/kotlin/io/rsocket/kotlin/frame/io/MimeTypeTest.kt b/rsocket-core/src/commonTest/kotlin/io/rsocket/kotlin/frame/io/MimeTypeTest.kt
index 03a769c0..6f2ce376 100644
--- a/rsocket-core/src/commonTest/kotlin/io/rsocket/kotlin/frame/io/MimeTypeTest.kt
+++ b/rsocket-core/src/commonTest/kotlin/io/rsocket/kotlin/frame/io/MimeTypeTest.kt
@@ -22,6 +22,12 @@ import kotlin.test.*
 
 class MimeTypeTest : TestWithLeakCheck {
 
+    private val asciiChars = '!'..'~'
+
+    private fun randomAsciiString(length: Int): String {
+        return (1..length).joinToString(separator = "") { asciiChars.random().toString() }
+    }
+
     @Test
     fun customMimeTypeSerialization() {
         testCustomMimeType("message/x.foo")
diff --git a/rsocket-core/src/commonTest/kotlin/io/rsocket/kotlin/frame/io/Util.kt b/rsocket-core/src/commonTest/kotlin/io/rsocket/kotlin/frame/io/Util.kt
deleted file mode 100644
index 33864f33..00000000
--- a/rsocket-core/src/commonTest/kotlin/io/rsocket/kotlin/frame/io/Util.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * Copyright 2015-2024 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package io.rsocket.kotlin.frame.io
-
-
-private val asciiChars = '!'..'~'
-
-internal fun randomAsciiString(length: Int): String {
-    return (1..length).joinToString(separator = "") { asciiChars.random().toString() }
-}