diff --git a/packages/mermaid/src/diagrams/user-journey/journeyRenderer.ts b/packages/mermaid/src/diagrams/user-journey/journeyRenderer.ts
index aecbe9d2e..28d750e1c 100644
--- a/packages/mermaid/src/diagrams/user-journey/journeyRenderer.ts
+++ b/packages/mermaid/src/diagrams/user-journey/journeyRenderer.ts
@@ -80,7 +80,7 @@ function drawActorLegend(diagram) {
         y: yPos + 7 + index * 20,
         fill: '#666',
         text: line,
-        textMargin: conf.boxTextMargin || 5,
+        textMargin: conf.boxTextMargin ?? 5,
       };
       svgDraw.drawText(diagram, labelData);
     });