diff --git a/encoders/protoc-gen-firebase-encoders/src/main/kotlin/com/google/firebase/encoders/proto/codegen/Types.kt b/encoders/protoc-gen-firebase-encoders/src/main/kotlin/com/google/firebase/encoders/proto/codegen/Types.kt
index 9a902916cf7..f829d95ed52 100644
--- a/encoders/protoc-gen-firebase-encoders/src/main/kotlin/com/google/firebase/encoders/proto/codegen/Types.kt
+++ b/encoders/protoc-gen-firebase-encoders/src/main/kotlin/com/google/firebase/encoders/proto/codegen/Types.kt
@@ -190,7 +190,7 @@ data class ProtoField(
 
   val lowerCamelCaseName: String
     get() {
-      return SNAKE_CASE_REGEX.replace(name) { it.value.replace("_", "").toUpperCase() }
+      return SNAKE_CASE_REGEX.replace(name) { it.value.replace("_", "").uppercase() }
     }
 
   val camelCaseName: String