diff --git a/src/Development/IDE/Core/Shake.hs b/src/Development/IDE/Core/Shake.hs
index a471070..a2b3183 100644
--- a/src/Development/IDE/Core/Shake.hs
+++ b/src/Development/IDE/Core/Shake.hs
@@ -503,7 +503,14 @@ isBadDependency x
 newtype Q k = Q (k, NormalizedFilePath)
     deriving (Eq,Hashable,NFData, Generic)
 
-instance Binary k => Binary (Q k)
+instance Binary k => Binary (Q k) where
+    put (Q (k, fp)) = put (k, fp)
+    get = do
+        (k, fp) <- get
+        -- The `get` implementation of NormalizedFilePath
+        -- does not handle empty file paths so we
+        -- need to handle this ourselves here.
+        pure (Q (k, toNormalizedFilePath' fp))
 
 instance Show k => Show (Q k) where
     show (Q (k, file)) = show k ++ "; " ++ fromNormalizedFilePath file