diff --git a/server/streamreader/pipe_stream.cpp b/server/streamreader/pipe_stream.cpp
index 11364fdc..f3cb207a 100644
--- a/server/streamreader/pipe_stream.cpp
+++ b/server/streamreader/pipe_stream.cpp
@@ -57,7 +57,7 @@ void PipeStream::do_connect()
 {
     int fd = open(uri_.path.c_str(), O_RDONLY | O_NONBLOCK);
     int pipe_size = -1;
-#if !defined(MACOS)
+#ifndef MACOS
     pipe_size = fcntl(fd, F_GETPIPE_SZ);
 #endif
     LOG(INFO, LOG_TAG) << "Stream: " << name_ << ", connect to pipe: " << uri_.path << ", fd: " << fd << ", pipe size: " << pipe_size << "\n";