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 <HASH>..<HASH> 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
@@ -104,6 +104,7 @@ final class WellKnownMutability {
         .add("com.google.protobuf.ByteString")
         .add("com.google.protobuf.Descriptors$Descriptor")
         .add("com.google.protobuf.Descriptors$EnumDescriptor")
+        .add("com.google.protobuf.Descriptors$EnumValueDescriptor")
         .add("com.google.protobuf.Descriptors$FieldDescriptor")
         .add("com.google.protobuf.Descriptors$FileDescriptor")
         .add("com.google.protobuf.Descriptors$ServiceDescriptor")
Marking EnumValueDescriptor as immutable in WellKnownMutability.

RELNOTES: N/A
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Created by MOE: <URL>