diff --git a/src/norm_engine.cpp b/src/norm_engine.cpp
index 4bb54766..630e7b0a 100644
--- a/src/norm_engine.cpp
+++ b/src/norm_engine.cpp
@@ -1,8 +1,6 @@
 
 #include "platform.hpp"
 
-#define ZMQ_HAVE_NORM 1
-
 #if defined ZMQ_HAVE_NORM
 
 #include "norm_engine.hpp"