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diff --git a/Constants.hs b/Constants.hs
index 9a3c4dd..cfb9d55 100644
--- a/Constants.hs
+++ b/Constants.hs
@@ -95,8 +95,8 @@ lengthId = "length"
 
 
 -- | isnull (function null in original Haskell source) function identifier
-isnullId :: String
-isnullId = "isnull"
+nullId :: String
+nullId = "null"
 
 
 -- | replace function identifier