diff --git a/sly/parser/generator/ParserBuilder.cs b/sly/parser/generator/ParserBuilder.cs
index dca6a1d4..8ae64de5 100644
--- a/sly/parser/generator/ParserBuilder.cs
+++ b/sly/parser/generator/ParserBuilder.cs
@@ -26,7 +26,7 @@ public class ParserBuilder<IN, OUT> where IN : struct
         
         public string I18n { get; set; }
 
-        public ParserBuilder(string i18n = null)
+        public ParserBuilder(string i18n)
         {
             if (string.IsNullOrEmpty(i18n))
             {
@@ -34,6 +34,10 @@ public ParserBuilder(string i18n = null)
             }
             I18n = i18n;
         }
+        
+        public ParserBuilder() : this(null)
+        {
+        }
 
         /// <summary>
         ///     Builds a parser (lexer, syntax parser and syntax tree visitor) according to a parser definition instance
diff --git a/sly/sly.csproj b/sly/sly.csproj
index 2c9dcf57..d31c86f5 100644
--- a/sly/sly.csproj
+++ b/sly/sly.csproj
@@ -6,11 +6,11 @@
     <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
     <Description>#LY is a parser generator halfway between parser combinators and parser generator like ANTLR</Description>
     <Authors>b3b00</Authors>
-    <version>2.7.0.0</version>
+    <version>2.7.0.1</version>
     <PackageProjectUrl>https://github.com/b3b00/sly</PackageProjectUrl>
     <RepositoryUrl>https://github.com/b3b00/sly</RepositoryUrl>
     <PackageLicenseUrl>https://github.com/b3b00/sly/blob/master/LICENSE</PackageLicenseUrl>
-    <PackageVersion>2.7.0.0</PackageVersion>
+    <PackageVersion>2.7.0.1</PackageVersion>
     <ApplicationIcon />
     <OutputType>Library</OutputType>
     <StartupObject />