diff --git a/servant-reflex.cabal b/servant-reflex.cabal
index 8ee8ff8..6e18539 100644
--- a/servant-reflex.cabal
+++ b/servant-reflex.cabal
@@ -15,6 +15,11 @@ Flag Example
   description: Enable example
   default: False
 
+Flag servant-auth
+  description: Enable servant-auth
+  default: True
+  manual: False
+
 library
   exposed-modules:
     Servant.Common.BaseUrl
@@ -40,11 +45,14 @@ library
     reflex-dom-core     >= 0.6  && < 0.7,
     safe                >= 0.3.9 && < 0.4,
     servant             >= 0.16  && < 0.18,
-    servant-auth        >= 0.2.1 && < 0.4,
     string-conversions  >= 0.4  && < 0.5,
     text                >= 1.2  && < 1.3,
     transformers        >= 0.4  && < 0.6
 
+  if flag(servant-auth)
+    build-depends:
+      servant-auth        >= 0.2.1 && < 0.4
+
   ghc-options: -Wall -fwarn-tabs -funbox-strict-fields
 
   default-language: Haskell2010
diff --git a/src/Servant/Reflex.hs b/src/Servant/Reflex.hs
index d972497..445900e 100644
--- a/src/Servant/Reflex.hs
+++ b/src/Servant/Reflex.hs
@@ -61,7 +61,6 @@ import           Servant.API             ((:<|>) (..), (:>), BasicAuth,
                                           ToHttpApiData (..), Vault, Verb,
                                           contentType)
 import           Servant.API.Description (Summary)
-import qualified Servant.Auth            as Auth
 
 import           Reflex.Dom.Core         (Dynamic, Event, Reflex,
                                           XhrRequest (..), XhrResponse (..),
@@ -90,6 +89,11 @@ import           Servant.Common.Req      (ClientOptions(..),
                                           reqTag,
                                           qParams, withCredentials)
 
+#ifdef servant-auth
+
+import qualified Servant.Auth            as Auth
+
+#endif
 
 -- * Accessing APIs as a Client
 
@@ -610,6 +614,9 @@ for empty and one for non-empty lists).
 
 -- @HasCookieAuth auths@ is nominally a redundant constraint, but ensures
 -- we're not trying to rely on cookies when the API does not use them.
+
+#ifdef servant-auth
+
 instance (HasCookieAuth auths, HasClient t m api tag) => HasClient t m (Auth.Auth auths a :> api) tag where
 
   type Client t m (Auth.Auth auths a :> api) tag = Client t m api tag
@@ -623,3 +630,4 @@ type family HasCookieAuth xs :: Constraint where
 
 class CookieAuthNotEnabled
 
+#endif
\ No newline at end of file