diff --git a/mixed-types-num.cabal b/mixed-types-num.cabal
--- a/mixed-types-num.cabal
+++ b/mixed-types-num.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           mixed-types-num
-version:        0.5.9.0
+version:        0.5.9.1
 synopsis:       Alternative Prelude with numeric and logic expressions typed bottom-up
 description:    Please see the README on GitHub at <https://github.com/michalkonecny/mixed-types-num#readme>
 category:       Math
diff --git a/src/MixedTypesNumPrelude.hs b/src/MixedTypesNumPrelude.hs
--- a/src/MixedTypesNumPrelude.hs
+++ b/src/MixedTypesNumPrelude.hs
@@ -34,6 +34,7 @@
   module Numeric.MixedTypes.AddSub,
   module Numeric.MixedTypes.Round,
   module Numeric.MixedTypes.Reduce,
+  module Numeric.MixedTypes.Mul,
   module Numeric.MixedTypes.Ring,
   module Numeric.MixedTypes.Div,
   module Numeric.MixedTypes.Power,
@@ -63,6 +64,7 @@
 import Numeric.MixedTypes.AddSub
 import Numeric.MixedTypes.Round
 import Numeric.MixedTypes.Reduce
+import Numeric.MixedTypes.Mul
 import Numeric.MixedTypes.Ring
 import Numeric.MixedTypes.Div
 import Numeric.MixedTypes.Power