diff --git a/src/gausskernel/storage/buffer/buf_init.cpp b/src/gausskernel/storage/buffer/buf_init.cpp
index 6bb2d89538038f1e183f869a6f44a36106f6313a..7caffbe525d2b7d258cf5a0ed65ca4a63d6fe2dd 100755
--- a/src/gausskernel/storage/buffer/buf_init.cpp
+++ b/src/gausskernel/storage/buffer/buf_init.cpp
@@ -175,6 +175,12 @@ Size BufferShmemSize(void)
     /* size of checkpoint sort array in bufmgr.c */
     size = add_size(size, mul_size(g_instance.attr.attr_storage.NBuffers, sizeof(CkptSortItem)));
 
+    /* size of candidate buffers */
+    size = add_size(size, mul_size(g_instance.attr.attr_storage.NBuffers, sizeof(Buffer)));
+
+    /* size of candidate free map */
+    size = add_size(size, mul_size(g_instance.attr.attr_storage.NBuffers, sizeof(bool)));
+
     return size;
 }