diff --git a/rebar.config b/rebar.config
index fcda477..cf95fac 100644
--- a/rebar.config
+++ b/rebar.config
@@ -34,7 +34,7 @@
              ]}.
 
 {port_env, [
-    {"DRV_CFLAGS",  "$DRV_CFLAGS -O3 -fPIC -march=native -mtune=native -Wall -Wextra -Werror"}
+    {"DRV_CFLAGS",  "$DRV_CFLAGS -O3 -fPIC -march=native -mtune=native -Wall -Wextra -Werror -ftrack-macro-expansion=2"}
 ]}.
 
 % for debugging use