diff --git a/test/data/Info.hs b/test/data/Info.hs
index 7370abc..4228f64 100644
--- a/test/data/Info.hs
+++ b/test/data/Info.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE TemplateHaskell #-} -- for HscInterpreted
+
 module Info () where
 
 fib :: Int -> Int
diff --git a/test/data/Mutual1.hs b/test/data/Mutual1.hs
index ef23310..1b73625 100644
--- a/test/data/Mutual1.hs
+++ b/test/data/Mutual1.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE TemplateHaskell #-} -- for HscInterpreted
+
 module Mutual1 where
 
 import Mutual2