diff --git a/lib/Makefile b/lib/Makefile
index b05061cd096..7e2778170d3 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -8,7 +8,7 @@
 ##===----------------------------------------------------------------------===##
 LEVEL = ..
 
-PARALLEL_DIRS = VMCore Analysis Transforms AsmParser Bytecode CodeGen Target CWriter ExecutionEngine
+PARALLEL_DIRS = VMCore Analysis Transforms AsmParser Bytecode CodeGen Target CWriter ExecutionEngine Debugger
 
 include $(LEVEL)/Makefile.common