diff --git a/Src/CSharpier.Core/CSharp/SyntaxPrinter/PrintingContext.cs b/Src/CSharpier.Core/CSharp/SyntaxPrinter/PrintingContext.cs
index e0f5176d4..d6368fa49 100644
--- a/Src/CSharpier.Core/CSharp/SyntaxPrinter/PrintingContext.cs
+++ b/Src/CSharpier.Core/CSharp/SyntaxPrinter/PrintingContext.cs
@@ -16,7 +16,7 @@ public string GroupFor(string value)
         var number = this.groupNumberByValue.GetValueOrDefault(value, 0) + 1;
         this.groupNumberByValue[value] = number;
 
-        return value + " #" + number;
+        return $"{value} #{number}";
     }
 
     public PrintingContext WithSkipNextLeadingTrivia()