diff --git a/project/SparkBuild.scala b/project/SparkBuild.scala
index 8e3dcc2f38..6018b22bae 100644
--- a/project/SparkBuild.scala
+++ b/project/SparkBuild.scala
@@ -723,8 +723,7 @@ object Unidoc {
         .map(_.filterNot(_.getCanonicalPath.contains("org/apache/hadoop")))
     },
 
-    // Javadoc options: create a window title, and group key packages on index page
-    javacOptions in doc := Seq(
+    javacOptions in (JavaUnidoc, unidoc) := Seq(
       "-windowtitle", "Spark " + version.value.replaceAll("-SNAPSHOT", "") + " JavaDoc",
       "-public",
       "-noqualifier", "java.lang"