diff --git a/apps/emqx/include/emqx_release.hrl b/apps/emqx/include/emqx_release.hrl
index fd19f6df3..b9dd84d09 100644
--- a/apps/emqx/include/emqx_release.hrl
+++ b/apps/emqx/include/emqx_release.hrl
@@ -36,6 +36,3 @@
 
 %% Enterprise edition
 -define(EMQX_RELEASE_EE, "5.5.0").
-
-%% The HTTP API version
--define(EMQX_API_VERSION, "5.0").