diff --git a/library/Makefile b/library/Makefile
index a5e023e..388fcea 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -341,7 +341,7 @@
 generated_files: $(GENERATED_FILES)
 
 # See root Makefile
-GEN_FILES ?=
+GEN_FILES ?= yes
 ifdef GEN_FILES
 gen_file_dep =
 else