diff --git a/support/tools/TableGen/Makefile b/support/tools/TableGen/Makefile
index 226fefa0e9f..21c68c6b02d 100644
--- a/support/tools/TableGen/Makefile
+++ b/support/tools/TableGen/Makefile
@@ -2,6 +2,8 @@ LEVEL = ../..
 TOOLNAME = tblgen
 USEDLIBS = support.a
 
+.PRECIOUS: FileLexer.cpp FileParser.cpp
+
 include $(LEVEL)/Makefile.common
 
 clean::