diff --git a/a8/asiotcpclient.cc b/a8/asiotcpclient.cc
index 6462601..abfef0a 100644
--- a/a8/asiotcpclient.cc
+++ b/a8/asiotcpclient.cc
@@ -14,6 +14,8 @@
 #include <a8/a8.h>
 #include <a8/asiotcpclient.h>
 
+#ifdef USE_ASIO
+
 const int MAX_RECV_BUFFERSIZE = 1024 * 64;
 
 namespace a8
@@ -249,3 +251,5 @@ namespace a8
     }
 
 }
+
+#endif
diff --git a/a8/asiotcpclient.h b/a8/asiotcpclient.h
index e676552..71dbfee 100644
--- a/a8/asiotcpclient.h
+++ b/a8/asiotcpclient.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#ifdef USE_ASIO
+
 namespace a8
 {
 
@@ -43,3 +45,5 @@ namespace a8
     };
 
 }
+
+#endif