diff --git a/kotlin-native/runtime/src/main/kotlin/kotlin/time/MonotonicTimeSource.kt b/kotlin-native/runtime/src/main/kotlin/kotlin/time/MonotonicTimeSource.kt
index ba372cefad8..8e5e805410b 100644
--- a/kotlin-native/runtime/src/main/kotlin/kotlin/time/MonotonicTimeSource.kt
+++ b/kotlin-native/runtime/src/main/kotlin/kotlin/time/MonotonicTimeSource.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -9,7 +9,18 @@ import kotlin.system.*
 
 @SinceKotlin("1.3")
 @ExperimentalTime
-internal actual object MonotonicTimeSource : AbstractLongTimeSource(unit = DurationUnit.NANOSECONDS), TimeSource { // TODO: interface should not be required here
-    override fun read(): Long = getTimeNanos()
-    override fun toString(): String = "TimeSource(nanoTime())"
-}
\ No newline at end of file
+internal actual object MonotonicTimeSource : TimeSource {
+    private val zero: Long = getTimeNanos()
+    private fun read(): Long = getTimeNanos() - zero
+    override fun toString(): String = "TimeSource(System.nanoTime())"
+
+    actual override fun markNow(): DefaultTimeMark = DefaultTimeMark(read())
+    actual fun elapsedFrom(timeMark: DefaultTimeMark): Duration =
+            saturatingDiff(read(), timeMark.reading)
+
+    actual fun adjustReading(timeMark: DefaultTimeMark, duration: Duration): DefaultTimeMark =
+            DefaultTimeMark(saturatingAdd(timeMark.reading, duration))
+}
+
+@Suppress("ACTUAL_WITHOUT_EXPECT") // visibility
+internal actual typealias DefaultTimeMarkReading = Long