diff --git a/kotlin/tests/src/test/kotlin/com/squareup/moshi/kotlin/codegen/ComplexGenericsInheritanceTest.kt b/kotlin/tests/src/test/kotlin/com/squareup/moshi/kotlin/codegen/ComplexGenericsInheritanceTest.kt
index a69f7d0..a3a16f8 100644
--- a/kotlin/tests/src/test/kotlin/com/squareup/moshi/kotlin/codegen/ComplexGenericsInheritanceTest.kt
+++ b/kotlin/tests/src/test/kotlin/com/squareup/moshi/kotlin/codegen/ComplexGenericsInheritanceTest.kt
@@ -126,7 +126,7 @@ abstract class Layer3<C, D> : Layer2<D>() {
 }
 
 @JsonClass(generateAdapter = true)
-data class Layer4<E, F>(
+data class Layer4<E : Personable, F>(
     val layer4E: E,
     val layer4F: F? = null
 ) : Layer3<List<Int>, String>(), LayerInterface<String>