diff --git a/rebar.config b/rebar.config
index c2bbe02..66e81cd 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,10 +1,11 @@
-
+%%-*- mode: erlang -*-
+%% ex: ft=erlang ts=4 sw=4 et
 {port_specs, [{"priv/wterl.so", ["c_src/*.c"]}]}.
 
 {port_env, [
-             {"DRV_CFLAGS",  "$DRV_CFLAGS -Werror -I c_src/system/include"},
-             {"DRV_LDFLAGS", "$DRV_LDFLAGS c_src/system/lib/libwiredtiger.a"}
-            ]}.
+            {"DRV_CFLAGS",  "$DRV_CFLAGS -Werror -I c_src/system/include"},
+            {"DRV_LDFLAGS", "$DRV_LDFLAGS c_src/system/lib/libwiredtiger.a"}
+           ]}.
 
 {pre_hooks, [{compile, "c_src/build_deps.sh"}]}.