diff --git a/Source/DGrok.Framework/Framework/TokenFilter.cs b/Source/DGrok.Framework/Framework/TokenFilter.cs
old mode 100644
new mode 100755
index f93665b..18ee46b
--- a/Source/DGrok.Framework/Framework/TokenFilter.cs
+++ b/Source/DGrok.Framework/Framework/TokenFilter.cs
@@ -133,6 +133,7 @@ public TokenFilter(IEnumerable<Token> tokens, CompilerDefines compilerDefines,
             _directiveTypes["WARNINGS"] = DirectiveType.Ignored;
             _directiveTypes["WEAKPACKAGEUNIT"] = DirectiveType.Ignored;
             _directiveTypes["WRITEABLECONST"] = DirectiveType.Ignored;
+            _directiveTypes["ZEROBASEDSTRINGS"] = DirectiveType.Ignored;
             // Directives for generation of C++Builder .hpp files
             _directiveTypes["EXTERNALSYM"] = DirectiveType.Ignored;
             _directiveTypes["HPPEMIT"] = DirectiveType.Ignored;
diff --git a/Source/DGrok.Tests/TokenFilterTests.cs b/Source/DGrok.Tests/TokenFilterTests.cs
old mode 100644
new mode 100755
index e23a715..c3f8a63
--- a/Source/DGrok.Tests/TokenFilterTests.cs
+++ b/Source/DGrok.Tests/TokenFilterTests.cs
@@ -95,6 +95,12 @@ public void CPlusPlusBuilderCompilerDirectivesAreIgnored()
             Assert.That("{$NOINCLUDE Foo}", LexesAndFiltersAs());
         }
         [Test]
+        public void ZeroBasedStringsCompilerDirectivesAreIgnored()
+        {
+            Assert.That("{$ZEROBASEDSTRINGS ON}", LexesAndFiltersAs());
+            Assert.That("{$ZEROBASEDSTRINGS OFF}", LexesAndFiltersAs());
+        }
+        [Test]
         public void IfDefTrue()
         {
             Assert.That("0{$IFDEF TRUE}1{$ENDIF}2", LexesAndFiltersAs(