diff --git a/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java b/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
index 6fab8ba..a2bcb74 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
@@ -141,7 +141,7 @@
     }
 
     public void setEditingPageNo(Integer editingPageNo) {
-        this.editingPageNo = MathUtils.clamp(editingPageNo, 0, 999);
+        this.editingPageNo = MathUtils.clamp(editingPageNo, 1, 999);
     }
 
     public void setCurrentAnimation(Animation currentAnimation) {