diff --git a/packages/frontend/src/components/MkRetentionHeatmap.vue b/packages/frontend/src/components/MkRetentionHeatmap.vue
index cdfbd0d9a..404dd4fd7 100644
--- a/packages/frontend/src/components/MkRetentionHeatmap.vue
+++ b/packages/frontend/src/components/MkRetentionHeatmap.vue
@@ -157,6 +157,7 @@ async function renderChart() {
 						display: true,
 						maxRotation: 0,
 						autoSkipPadding: 8,
+						callback: (value, index, values) => value + 1,
 					},
 				},
 				y: {