diff --git a/compiler/ir/serialization.js/build.gradle.kts b/compiler/ir/serialization.js/build.gradle.kts
index f86a6cb8bf2..dcaa8d4bafd 100644
--- a/compiler/ir/serialization.js/build.gradle.kts
+++ b/compiler/ir/serialization.js/build.gradle.kts
@@ -114,6 +114,7 @@ val reducedRuntimeSources by task<Sync> {
                 "libraries/stdlib/js/src/kotlin/char.kt",
                 "libraries/stdlib/js/src/kotlin/collections.kt",
                 "libraries/stdlib/js/src/kotlin/collections/**",
+                "libraries/stdlib/js/src/kotlin/time/**",
                 "libraries/stdlib/js/src/kotlin/console.kt",
                 "libraries/stdlib/js/src/kotlin/coreDeprecated.kt",
                 "libraries/stdlib/js/src/kotlin/date.kt",
@@ -129,6 +130,7 @@ val reducedRuntimeSources by task<Sync> {
                 "libraries/stdlib/src/kotlin/properties/Delegates.kt",
                 "libraries/stdlib/src/kotlin/random/URandom.kt",
                 "libraries/stdlib/src/kotlin/text/**",
+                "libraries/stdlib/src/kotlin/time/**",
                 "libraries/stdlib/src/kotlin/util/KotlinVersion.kt",
                 "libraries/stdlib/src/kotlin/util/Tuples.kt",
                 "libraries/stdlib/js/src/kotlin/dom/**",