diff --git a/lib/Makefile.am b/lib/Makefile.am
index 32240ae..3cb592c 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -17,7 +17,7 @@
 SUBDIRS += erl
 endif
 
-if ENABLE_RUBY
+if WITH_RUBY
 SUBDIRS += rb
 endif