diff --git a/lib/Transforms/Makefile b/lib/Transforms/Makefile
index 05bf1031443..c9965f3c039 100644
--- a/lib/Transforms/Makefile
+++ b/lib/Transforms/Makefile
@@ -1,5 +1,5 @@
 LEVEL = ../..
-DIRS = Instrumentation
+DIRS = Instrumentation IPO
 
 LIBRARYNAME = transforms