diff --git a/node.go b/node.go
index 82d3fb9..9fb2cf8 100644
--- a/node.go
+++ b/node.go
@@ -1082,6 +1082,14 @@ func (this *conversionState) convertNoFreeFloating(n_ node.Node) (string, error)
 	case *expr.ShortArray:
 		return this.convertArrayLiteralCommon(n.Items)
 
+	case *expr.BooleanNot:
+		rhs, err := this.convert(n.Expr)
+		if err != nil {
+			return "", parseErr{n, err}
+		}
+
+		return "!(" + rhs + ")", nil
+
 	case *expr.ArrayDimFetch:
 		// Might be x[foo], might be x[] (i.e. append() call)
 		// In order to make the append() transformation, we need to lookahead