diff --git a/graph b/graph
index d62b2b6..a055aa9 100755
--- a/graph
+++ b/graph
@@ -319,6 +319,7 @@ else
 		)
 	fi
 
+	(( start > -1209600 )) && datastart=-1209600
 	(( start > 0 )) && start="+$start"
 	(( end > 0 )) && end="+$end"
 	rrdtool graph - 					\