diff --git a/core/src/main/java/com/google/errorprone/bugpatterns/threadsafety/WellKnownMutability.java b/core/src/main/java/com/google/errorprone/bugpatterns/threadsafety/WellKnownMutability.java
index 7fd292b7554..8a2bb04a368 100644
--- a/core/src/main/java/com/google/errorprone/bugpatterns/threadsafety/WellKnownMutability.java
+++ b/core/src/main/java/com/google/errorprone/bugpatterns/threadsafety/WellKnownMutability.java
@@ -228,6 +228,10 @@ private static ImmutableMap<String, AnnotationInfo> buildImmutableClasses(
         .add("kotlin.Pair", "A", "B")
         .add("kotlin.Triple", "A", "B", "C")
         .add("kotlin.time.Duration")
+        .add("kotlin.ranges.IntRange")
+        .add("kotlin.ranges.LongRange")
+        .add("kotlin.ranges.UIntRange")
+        .add("kotlin.ranges.ULongRange")
         .add("org.threeten.bp.Duration")
         .add("org.threeten.bp.Instant")
         .add("org.threeten.bp.LocalDate")