diff --git a/libraries/stdlib/unsigned/src/kotlin/UProgressionUtil.kt b/libraries/stdlib/unsigned/src/kotlin/UProgressionUtil.kt
index 971f4974d5d..d2725418d44 100644
--- a/libraries/stdlib/unsigned/src/kotlin/UProgressionUtil.kt
+++ b/libraries/stdlib/unsigned/src/kotlin/UProgressionUtil.kt
@@ -3,6 +3,7 @@
  * that can be found in the license/LICENSE.txt file.
  */
 
+@file:UseExperimental(ExperimentalUnsignedTypes::class)
 package kotlin.internal
 
 // (a - b) mod c
diff --git a/libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt b/libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt
index 198ee51e78f..c446e062aa5 100644
--- a/libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt
+++ b/libraries/stdlib/unsigned/src/kotlin/UnsignedUtils.kt
@@ -3,6 +3,7 @@
  * that can be found in the license/LICENSE.txt file.
  */
 
+@file:UseExperimental(ExperimentalUnsignedTypes::class)
 package kotlin
 
 internal fun uintCompare(v1: Int, v2: Int): Int = (v1 xor Int.MIN_VALUE).compareTo(v2 xor Int.MIN_VALUE)