diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,7 @@
+0.4.1.1
+-------
+* Fixed infinite loop in definition of negate.
+
 0.4.1.0
 -------
 * Added function for computing rational approximations of ExactPi values.
diff --git a/exact-pi.cabal b/exact-pi.cabal
--- a/exact-pi.cabal
+++ b/exact-pi.cabal
@@ -2,11 +2,12 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                exact-pi
-version:             0.4.1.0
+version:             0.4.1.1
 synopsis:            Exact rational multiples of pi (and integer powers of pi)
 description:         Provides an exact representation for rational multiples of pi alongside an approximate representation of all reals.
                      Useful for storing and computing with conversion factors between physical units.
-homepage:            https://github.com/dmcclean/exact-pi
+homepage:            https://github.com/dmcclean/exact-pi/
+bug-reports:         https://github.com/dmcclean/exact-pi/issues/
 license:             MIT
 license-file:        LICENSE
 author:              Douglas McClean
diff --git a/src/Data/ExactPi.hs b/src/Data/ExactPi.hs
--- a/src/Data/ExactPi.hs
+++ b/src/Data/ExactPi.hs
@@ -135,7 +135,7 @@
   abs (Approximate x) = Approximate $ abs x
   signum (Exact _ q) = Exact 0 (signum q)
   signum (Approximate x) = Approximate $ signum x -- we leave this tagged as approximate because we don't know "how" approximate the input was. a case could be made for exact answers here.
-  negate x = (-1) * x
+  negate x = (Exact 0 (-1)) * x
 
 instance Fractional ExactPi where
   fromRational = Exact 0