diff --git a/src/gausskernel/storage/smgr/segment/extent_group.cpp b/src/gausskernel/storage/smgr/segment/extent_group.cpp
index 4554203ef0559c1a15d2ca3a6e8507f2814d8100..b472a35db4b01c656058c08b39dbc263e3fcc347 100644
--- a/src/gausskernel/storage/smgr/segment/extent_group.cpp
+++ b/src/gausskernel/storage/smgr/segment/extent_group.cpp
@@ -333,7 +333,7 @@ void eg_init_bitmap_page_content(Page bitmap_page, BlockNumber first_page)
     df_map_page->first_page = first_page;
 
     PageHeader bitmap_page_header = (PageHeader)bitmap_page;
-    SegmentCheck(bitmap_page_header->pd_upper = BLCKSZ);
+    SegmentCheck(bitmap_page_header->pd_upper == BLCKSZ);
     bitmap_page_header->pd_lower = bitmap_page_header->pd_upper;
 }