diff --git a/runtime/CSharp/runtime/CSharp/Antlr4.Runtime/TokenStreamRewriter.cs b/runtime/CSharp/runtime/CSharp/Antlr4.Runtime/TokenStreamRewriter.cs
index d09bbde3b..8ba429c60 100644
--- a/runtime/CSharp/runtime/CSharp/Antlr4.Runtime/TokenStreamRewriter.cs
+++ b/runtime/CSharp/runtime/CSharp/Antlr4.Runtime/TokenStreamRewriter.cs
@@ -627,7 +627,7 @@ namespace Antlr4.Runtime
                     }
                     else
                     {
-                        if ( !disjoint )
+                        if (!disjoint)
                         {
                             throw new ArgumentException("replace op boundaries of " + rop + " overlap with previous " + prevRop);
                         }