1 files changed, 1 insertions, 1 deletions

diff --git a/lib/Data/Packed/Internal/Matrix.hs b/lib/Data/Packed/Internal/Matrix.hs
index 951cec6..63ebddf 100644
--- a/lib/Data/Packed/Internal/Matrix.hs
+++ b/lib/Data/Packed/Internal/Matrix.hs
@@ -349,7 +349,7 @@ foreign import ccall safe "aux.h constantC"
 @> constant 2 7
 7 |> [2.0,2.0,2.0,2.0,2.0,2.0,2.0]@
 -}
-constant :: Double -> Int -> Vector Double
+constant :: Field a => a -> Int -> Vector a
 constant = constantD
 
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