diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,7 @@
+0.8.1
+------
+* compatibility with smallcheck-1.2.0
+
 0.8.0
 ------
 * GHC 8.8 compatibility added (GHC 8.6 didn't need any updates). Dropped
diff --git a/test/Test/SmallCheck/Series/Instances.hs b/test/Test/SmallCheck/Series/Instances.hs
--- a/test/Test/SmallCheck/Series/Instances.hs
+++ b/test/Test/SmallCheck/Series/Instances.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
@@ -14,6 +15,7 @@
 
 import Codec.Xlsx
 
+#if !MIN_VERSION_smallcheck(1,2,0)
 cons6 ::
      ( Serial m a6
      , Serial m a5
@@ -31,6 +33,7 @@
     <~> series
     <~> series
     <~> series
+#endif
 
 instance Monad m => Serial m Text where
   series = T.pack <$> series
diff --git a/xlsx.cabal b/xlsx.cabal
--- a/xlsx.cabal
+++ b/xlsx.cabal
@@ -1,6 +1,6 @@
 Name:                xlsx
 
-Version:             0.8.0
+Version:             0.8.1
 
 Synopsis:            Simple and incomplete Excel file parser/writer
 Description: