diff --git a/app/src/main/java/org/ntlab/acanthus_client/views/paint/models/PageOperationModel.java b/app/src/main/java/org/ntlab/acanthus_client/views/paint/models/PageOperationModel.java
index d99f279..f47118a 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/views/paint/models/PageOperationModel.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/views/paint/models/PageOperationModel.java
@@ -65,7 +65,8 @@
     public void incrementPageNo(MutableLiveData<Integer> mPageNo, Integer pageSize) {
         Integer editingNo = acanthus.getEditingPageNo();
 
-        if (editingNo < pageSize) {
+        if (editingNo <= pageSize) {
+            if(999 < pageSize) return;
             acanthus.setEditingPageNo(editingNo + 1);
             mPageNo.setValue(acanthus.getEditingPageNo());
         }