1 files changed, 4 insertions, 3 deletions

diff --git a/packages/tests/src/Numeric/LinearAlgebra/Tests/Instances.hs b/packages/tests/src/Numeric/LinearAlgebra/Tests/Instances.hs
index 97cfd01..12eddb2 100644
--- a/packages/tests/src/Numeric/LinearAlgebra/Tests/Instances.hs
+++ b/packages/tests/src/Numeric/LinearAlgebra/Tests/Instances.hs
@@ -33,6 +33,7 @@ import System.Random
 import Numeric.LinearAlgebra.HMatrix hiding (vector)
 import Control.Monad(replicateM)
 import Test.QuickCheck(Arbitrary,arbitrary,choose,vector,sized,shrink)
+import Foreign.Storable
 
 import GHC.TypeLits
 import Data.Proxy (Proxy(..))
@@ -69,7 +70,7 @@ instance KnownNat n => Arbitrary (Static.R n) where
 
     shrink _v = []
 
-instance (Element a, Arbitrary a) => Arbitrary (Matrix a) where
+instance (Storable a, Arbitrary a) => Arbitrary (Matrix a) where
     arbitrary = do
         m <- chooseDim
         n <- chooseDim
@@ -98,7 +99,7 @@ instance (KnownNat n, KnownNat m) => Arbitrary (Static.L m n) where
 
 -- a square matrix
 newtype (Sq a) = Sq (Matrix a) deriving Show
-instance (Element a, Arbitrary a) => Arbitrary (Sq a) where
+instance (Storable a, Arbitrary a) => Arbitrary (Sq a) where
     arbitrary = do
         n <- chooseDim
         l <- vector (n*n)
@@ -141,7 +142,7 @@ instance (Field a, Arbitrary a, Num (Vector a)) => Arbitrary (Herm a) where
         return $ sym m'
 
 
-class (Field a, Arbitrary a, Element (RealOf a), Random (RealOf a)) => ArbitraryField a
+class (Field a, Arbitrary a, Storable (RealOf a), Random (RealOf a)) => ArbitraryField a
 instance ArbitraryField Double
 instance ArbitraryField (Complex Double)