diff --git a/libraries/HTTPClient/src/HTTPClient.h b/libraries/HTTPClient/src/HTTPClient.h
index 1bb84d6d..fb6a7d4d 100644
--- a/libraries/HTTPClient/src/HTTPClient.h
+++ b/libraries/HTTPClient/src/HTTPClient.h
@@ -27,7 +27,9 @@
 #ifndef HTTPClient_H_
 #define HTTPClient_H_
 
+#ifndef HTTPCLIENT_1_1_COMPATIBLE
 #define HTTPCLIENT_1_1_COMPATIBLE
+#endif
 
 #include <memory>
 #include <Arduino.h>