diff --git a/CMakeLists.txt b/CMakeLists.txt
index 69421b52..fde73149 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -157,7 +157,7 @@ check_function_exists(gethrtime HAVE_GETHRTIME)
 set(CMAKE_REQUIRED_INCLUDES )
 
 add_definitions(-D_REENTRANT -D_THREAD_SAFE)
-add_definitions(-D_USING_CMAKE)
+add_definitions(-DZMQ_USING_CMAKE)
 
 option(ENABLE_EVENTFD "Enable/disable eventfd" ZMQ_HAVE_EVENTFD)
 
diff --git a/tests/testutil.hpp b/tests/testutil.hpp
index ed1915ee..2f0b48cb 100644
--- a/tests/testutil.hpp
+++ b/tests/testutil.hpp
@@ -32,7 +32,7 @@
 
 #include "../include/zmq.h"
 #include "../src/stdint.hpp"
-#ifdef USING_CMAKE
+#ifdef ZMQ_USING_CMAKE
 #   include "platform.hpp"
 #else
 #   include "../src/platform.hpp"