diff --git a/runtime/Go/antlr/file_stream.go b/runtime/Go/antlr/file_stream.go
index 540cf5030..842170c08 100644
--- a/runtime/Go/antlr/file_stream.go
+++ b/runtime/Go/antlr/file_stream.go
@@ -28,9 +28,9 @@ func NewFileStream(fileName string) (*FileStream, error) {
 		return nil, err
 	}
 	defer f.Close()
-	err = io.Copy(buf, f)
+	_, err = io.Copy(buf, f)
 	if err != nil {
-		return nil, er
+		return nil, err
 	}
 
 	fs := new(FileStream)