diff --git a/builds/cmake/platform.hpp.in b/builds/cmake/platform.hpp.in
index e5254d73..413a9548 100644
--- a/builds/cmake/platform.hpp.in
+++ b/builds/cmake/platform.hpp.in
@@ -31,7 +31,7 @@
 #cmakedefine ZMQ_MAKE_VALGRIND_HAPPY
 
 #cmakedefine ZMQ_HAVE_CURVE
-#cmakedefine HAVE_TWEETNACL
+#cmakedefine ZMQ_USE_TWEETNACL
 #cmakedefine HAVE_LIBSODIUM
 
 #ifdef _AIX