diff --git a/build.sbt b/build.sbt
index 9fd4f9173..1569ec94e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -119,7 +119,7 @@ lazy val interfaceProj = (project in file("interface")).
 // defines operations on the API of a source, including determining whether it has changed and converting it to a string
 //   and discovery of Projclasses and annotations
 lazy val apiProj = (project in compilePath / "api").
-  dependsOn(interfaceProj).
+  dependsOn(interfaceProj, classfileProj).
   settings(
     testedBaseSettings,
     name := "API"