diff --git a/numeric-prelude.cabal b/numeric-prelude.cabal
--- a/numeric-prelude.cabal
+++ b/numeric-prelude.cabal
@@ -1,5 +1,5 @@
 Name:           numeric-prelude
-Version:        0.3
+Version:        0.3.0.1
 License:        GPL
 License-File:   LICENSE
 Author:         Dylan Thurston <dpt@math.harvard.edu>, Henning Thielemann <numericprelude@henning-thielemann.de>, Mikael Johansson
@@ -154,7 +154,7 @@
   default:     False
 
 Source-Repository this
-  Tag:         0.2.2
+  Tag:         0.3.0.1
   Type:        darcs
   Location:    http://code.haskell.org/numeric-prelude/
 
@@ -169,11 +169,11 @@
     storable-record >=0.0.1 && <0.1,
     non-negative >=0.0.5 && <0.2,
     utility-ht >=0.0.6 && <0.1,
-    deepseq >=1.1 && <1.3
+    deepseq >=1.1 && <1.4
   If flag(splitBase)
     Build-Depends:
-      base >= 2 && <6,
-      array >=0.1 && <0.4,
+      base >= 2 && <5,
+      array >=0.1 && <0.5,
       containers >=0.1 && <0.5,
       random >=1.0 && <1.1
   Else
diff --git a/src/MathObj/Wrapper/Haskell98.hs b/src/MathObj/Wrapper/Haskell98.hs
--- a/src/MathObj/Wrapper/Haskell98.hs
+++ b/src/MathObj/Wrapper/Haskell98.hs
@@ -121,7 +121,7 @@
    gcd = gcd
    lcm = lcm
 
-instance (Num a) => ZeroTestable.C (T a) where
+instance (Eq a, Num a) => ZeroTestable.C (T a) where
    isZero (Cons a) = a==0
 
 instance (Num a) => Absolute.C (T a) where