diff --git a/rebar.config b/rebar.config
index 8715924..d6eb828 100644
--- a/rebar.config
+++ b/rebar.config
@@ -4,7 +4,7 @@
 
 {port_specs, [{"priv/jiffy.so", ["c_src/*.c"]}]}.
 
-{port_envs, [
+{port_env, [
     %% Link the spidermonkey library
     {".*", "CFLAGS", "$CFLAGS -g -Wall"},