diff --git a/src/Reflex/Time.hs b/src/Reflex/Time.hs
index 43917688..9241eaab 100644
--- a/src/Reflex/Time.hs
+++ b/src/Reflex/Time.hs
@@ -28,6 +28,7 @@ import Control.Monad.IO.Class
 import Data.Align
 import Data.Data (Data)
 import Data.Fixed
+import Data.Semigroup
 import Data.Sequence (Seq, (|>))
 import qualified Data.Sequence as Seq
 import Data.These
@@ -369,4 +370,3 @@ tickInfo_alreadyElapsed :: Lens' TickInfo NominalDiffTime
 tickInfo_alreadyElapsed f (TickInfo x1 x2 x3) = (\y -> TickInfo x1 x2 y) <$> f x3
 {-# INLINE tickInfo_alreadyElapsed #-}
 #endif
-