diff --git a/libpurgeablemem/common/src/ux_page_table_c.c b/libpurgeablemem/common/src/ux_page_table_c.c
index 42a143cbb693f7bea1b6bf832604ce8fb04529bc..fc0bbc865fe0ef50f5452662f979e5019ad85409 100644
--- a/libpurgeablemem/common/src/ux_page_table_c.c
+++ b/libpurgeablemem/common/src/ux_page_table_c.c
@@ -98,11 +98,11 @@ static size_t GetUxPageSize(uint64_t dataAddr, size_t dataSize)
         HILOG_ERROR(LOG_CORE, "pageNoEnd < pageNoStart");
         return 0;
     }
-    if (pageNoEnd - pageNoStart > SIZE_MAX / PAGE_SIZE) {
-        HILOG_ERROR(LOG_CORE, "pageNoEnd - pageNoStart > SIZE_MAX / PAGE_SIZE");
+    if (pageNoEnd - pageNoStart + 1 > SIZE_MAX / PAGE_SIZE) {
+        HILOG_ERROR(LOG_CORE, "pageNoEnd - pageNoStart + 1 > SIZE_MAX / PAGE_SIZE");
         return 0;
     }
-    return (pageNoEnd - pageNoStart) * PAGE_SIZE;
+    return (pageNoEnd - pageNoStart + 1) * PAGE_SIZE;
 }
 
 static inline uint64_t RoundUp(uint64_t val, size_t align)