diff --git a/src/mod/applications/mod_esf/Makefile b/src/mod/applications/mod_esf/Makefile
index c6d645e6aa..2c35e6e98f 100644
--- a/src/mod/applications/mod_esf/Makefile
+++ b/src/mod/applications/mod_esf/Makefile
@@ -1,2 +1,2 @@
 BASE=../../../..
-include /usr/src/freeswitch.trunk/build/modmake.rules
+include $(BASE)/build/modmake.rules