diff --git a/src/commands/mp.ts b/src/commands/mp.ts
index 788787e..476cd8e 100644
--- a/src/commands/mp.ts
+++ b/src/commands/mp.ts
@@ -118,7 +118,7 @@ export default {
                 // 30m mark
                 ctx.setLineDash([8, 16]);
                 ctx.beginPath();
-                const lastMonthStart = graphOrigin[0] + (nodeWidth * (data.length - 60));
+                const lastMonthStart = graphOrigin[0] + (nodeWidth * (data.length - 30));
                 ctx.lineTo(lastMonthStart, graphOrigin[1]);
                 ctx.lineTo(lastMonthStart, graphOrigin[1] + graphSize[1]);
                 ctx.stroke();
@@ -316,4 +316,4 @@ export default {
     /*  .addSubcommand((opt)=>opt
             .setName('series')
             .setDescription('Step-by-step on joining Daggerwin\'s MP series')) */
-}
\ No newline at end of file
+}