diff --git a/packages/core/src/vivliostyle/css-styler.ts b/packages/core/src/vivliostyle/css-styler.ts
index c809ed996..3589a51a8 100644
--- a/packages/core/src/vivliostyle/css-styler.ts
+++ b/packages/core/src/vivliostyle/css-styler.ts
@@ -394,7 +394,7 @@ export class BoxStack {
     const parent = this.lastBox();
     if (parent) {
       if (parent.flowName === box.flowName) {
-        if (box.hasBox()) {
+        if (box.hasBox() && !Display.isRunning(box.styleValue("position"))) {
           this.atBlockStart = this.atFlowStart = false;
         }
       } else {