diff --git a/runtime/src/main/kotlin/kotlin/time/MonotonicTimeSource.kt b/runtime/src/main/kotlin/kotlin/time/MonotonicTimeSource.kt
index 5e592dc058f..ba372cefad8 100644
--- a/runtime/src/main/kotlin/kotlin/time/MonotonicTimeSource.kt
+++ b/runtime/src/main/kotlin/kotlin/time/MonotonicTimeSource.kt
@@ -11,5 +11,5 @@ import kotlin.system.*
 @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)"
-}
+    override fun toString(): String = "TimeSource(nanoTime())"
+}
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