diff --git a/Makefile b/Makefile
index e81a3da..f5b32da 100644
--- a/Makefile
+++ b/Makefile
@@ -266,3 +266,5 @@ $(BUILD_DIR)/%.html: %.php
 	php $< >$@
 
 graph: $(BUILD_DIR)/cpu-daily$(EXTENSION) $(BUILD_DIR)/load-daily$(EXTENSION) $(BUILD_DIR)/mem-daily$(EXTENSION) $(BUILD_DIR)/net-daily$(EXTENSION) $(BUILD_DIR)/net-weekly$(EXTENSION) $(BUILD_DIR)/net-monthly$(EXTENSION) $(BUILD_DIR)/disk-daily$(EXTENSION) $(BUILD_DIR)/disk-weekly$(EXTENSION) $(BUILD_DIR)/disk-monthly$(EXTENSION) $(BUILD_DIR)/index.html
+
+.PHONY: $(BUILD_DIR)/index.html