diff --git a/lib/Makefile b/lib/Makefile
index 8364f3c2f48..d0f6f57d393 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -2,7 +2,5 @@ LEVEL = ..
 
 PARALLEL_DIRS = VMCore Analysis Transforms AsmParser Bytecode Support CodeGen Target CWriter
 
-OPTIONAL_DIRS = Reoptimizer
-
 include $(LEVEL)/Makefile.common