diff --git a/lib/Makefile b/lib/Makefile
index eea7ca090d6..c778d219d6e 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -1,5 +1,6 @@
 LEVEL = ..
-DIRS = VMCore Analysis Transforms AsmParser Bytecode Support CodeGen Target CWriter
+
+DIRS = VMCore Analysis Transforms AsmParser Bytecode Support CodeGen Target CWriter Reoptimizer
 
 include $(LEVEL)/Makefile.common