diff --git a/moshi-kotlin-codegen/src/main/java/com/squareup/moshi/kotlin/codegen/api/AdapterGenerator.kt b/moshi-kotlin-codegen/src/main/java/com/squareup/moshi/kotlin/codegen/api/AdapterGenerator.kt
index 00a17f3..5ed37d3 100644
--- a/moshi-kotlin-codegen/src/main/java/com/squareup/moshi/kotlin/codegen/api/AdapterGenerator.kt
+++ b/moshi-kotlin-codegen/src/main/java/com/squareup/moshi/kotlin/codegen/api/AdapterGenerator.kt
@@ -71,6 +71,7 @@ public class AdapterGenerator(
       "DEPRECATION",
       // Because we look it up reflectively
       "unused",
+      "UNUSED_PARAMETER",
       // Because we include underscores
       "ClassName",
       // Because we generate redundant `out` variance for some generics and there's no way