diff --git a/libraries/stdlib/common/src/kotlin/KotlinH.kt b/libraries/stdlib/common/src/kotlin/KotlinH.kt
index 2581a2bcaa2..a96b9fea046 100644
--- a/libraries/stdlib/common/src/kotlin/KotlinH.kt
+++ b/libraries/stdlib/common/src/kotlin/KotlinH.kt
@@ -80,6 +80,7 @@ public expect fun Float.Companion.fromBits(bits: Int): Float
 //@Deprecated("Use Volatile annotation from kotlin.jvm package", ReplaceWith("kotlin.jvm.Volatile"), level = DeprecationLevel.WARNING)
 //public typealias Volatile = kotlin.jvm.Volatile
 
+@Deprecated("Synchronization on any object is not supported on every platform and will be removed from the common standard library soon.")
 public expect inline fun <R> synchronized(lock: Any, block: () -> R): R