diff --git a/app/stackage.hs b/app/stackage.hs
index f1b14a7d..d80bbdb2 100644
--- a/app/stackage.hs
+++ b/app/stackage.hs
@@ -67,7 +67,7 @@ withBuildSettings args f = do
     bp <- readBuildPlan buildPlanSrc
     let settings = defaultBuildSettings
             { sandboxRoot = sandbox
-            , extraArgs = extraArgs' $ extraArgs defaultBuildSettings
+            , extraArgs = extraArgs' . extraArgs defaultBuildSettings
             }
     f settings bp