diff --git a/tool/builddir/build.mk b/tool/builddir/build.mk
index 567e44fe1..ccb63cc65 100644
--- a/tool/builddir/build.mk
+++ b/tool/builddir/build.mk
@@ -111,7 +111,7 @@ init_progress_log:
 	@echo "# Library build progress log - generated by dep_prg.mk and dep_lib.mk" >> $(LIB_PROGRESS_LOG)
 	@echo "#" >> $(LIB_PROGRESS_LOG)
 
-.PHONY: init_libdep_file
+.PHONY: init_libdep_file $(dir $(LIB_DEP_FILE))
 init_libdep_file:
 	@echo "checking library dependencies..."
 	@(echo "#"; \