diff --git a/mulang.cabal b/mulang.cabal
--- a/mulang.cabal
+++ b/mulang.cabal
@@ -1,5 +1,5 @@
 name:                mulang
-version:             3.6.0
+version:             3.6.1
 synopsis:            An intermediate language designed to perform advanced code analysis
 description:         Mulang is an intermediate language, a combinators library for static code analysis and a multilanguage comand line tool
 license:             GPL
diff --git a/src/Language/Mulang/Parsers/JavaScript.hs b/src/Language/Mulang/Parsers/JavaScript.hs
--- a/src/Language/Mulang/Parsers/JavaScript.hs
+++ b/src/Language/Mulang/Parsers/JavaScript.hs
@@ -111,6 +111,7 @@
 --muJSExpression (JSMemberSquare JSExpression _ JSExpression _) -- ^firstpart, lb, expr, rb
 muJSExpression (JSNewExpression _ (JSIdentifier _ name))            = New name []
 muJSExpression (JSObjectLiteral _ propertyList _)                   = MuObject (compactMap id.map muJSObjectProperty.muJSCommaTrailingList $ propertyList)
+muJSExpression (JSUnaryExpression (JSUnaryOpNot _) e)               = Application (Reference "!") [muJSExpression e]
 muJSExpression (JSUnaryExpression op (JSIdentifier _ name))         = Assignment name (muJSUnaryOp op name)
 muJSExpression (JSVarInitExpression (JSIdentifier _ name) initial)  = Variable name (muJSVarInitializer initial)
 muJSExpression _ = Other
@@ -147,7 +148,6 @@
 --muJSUnaryOp (JSUnaryOpDelete _)
 muJSUnaryOp (JSUnaryOpIncr _) r = (Application (Reference "+") [Reference r, MuNumber 1])
 --muJSUnaryOp (JSUnaryOpMinus _)
---muJSUnaryOp (JSUnaryOpNot _)
 --muJSUnaryOp (JSUnaryOpPlus _)
 --muJSUnaryOp (JSUnaryOpTilde _)
 --muJSUnaryOp (JSUnaryOpTypeof _)