diff --git a/Crypto/Internal/DeepSeq.hs b/Crypto/Internal/DeepSeq.hs
index 9da7988..86b7845 100644
--- a/Crypto/Internal/DeepSeq.hs
+++ b/Crypto/Internal/DeepSeq.hs
@@ -30,4 +30,6 @@ instance NFData Word64 where rnf w = w `seq` ()
 instance NFData Bytes where rnf b = b `seq` ()
 instance NFData ScrubbedBytes where rnf b = b `seq` ()
 
+instance NFData Integer  where rnf i = i `seq` ()
+
 #endif