1 files changed, 2 insertions, 2 deletions

diff --git a/packages/base/src/Numeric/Matrix.hs b/packages/base/src/Numeric/Matrix.hs
index a9022c6..5f27652 100644
--- a/packages/base/src/Numeric/Matrix.hs
+++ b/packages/base/src/Numeric/Matrix.hs
@@ -37,7 +37,7 @@ import Numeric.Chain
 instance Container Matrix a => Eq (Matrix a) where
     (==) = equal
 
-instance (Container Matrix a, Num (Vector a)) => Num (Matrix a) where
+instance (Container Matrix a, Num a, Num (Vector a)) => Num (Matrix a) where
     (+) = liftMatrix2Auto (+)
     (-) = liftMatrix2Auto (-)
     negate = liftMatrix negate
@@ -48,7 +48,7 @@ instance (Container Matrix a, Num (Vector a)) => Num (Matrix a) where
 
 ---------------------------------------------------
 
-instance (Container Vector a, Fractional (Vector a), Num (Matrix a)) => Fractional (Matrix a) where
+instance (Container Vector a, Fractional a, Fractional (Vector a), Num (Matrix a)) => Fractional (Matrix a) where
     fromRational n = (1><1) [fromRational n]
     (/) = liftMatrix2Auto (/)