diff --git a/runtime/CSharp/Antlr4.Runtime/ANTLRFileStream.cs b/runtime/CSharp/Antlr4.Runtime/AntlrFileStream.cs
similarity index 100%
rename from runtime/CSharp/Antlr4.Runtime/ANTLRFileStream.cs
rename to runtime/CSharp/Antlr4.Runtime/AntlrFileStream.cs
diff --git a/runtime/CSharp/Antlr4.Runtime/ANTLRInputStream.cs b/runtime/CSharp/Antlr4.Runtime/AntlrInputStream.cs
similarity index 100%
rename from runtime/CSharp/Antlr4.Runtime/ANTLRInputStream.cs
rename to runtime/CSharp/Antlr4.Runtime/AntlrInputStream.cs