diff --git a/src/backend/storage/file/buffile.c b/src/backend/storage/file/buffile.c
index 56b88594cc8..0654acacbe3 100644
--- a/src/backend/storage/file/buffile.c
+++ b/src/backend/storage/file/buffile.c
@@ -452,7 +452,7 @@ BufFileLoadBuffer(BufFile *file)
 	 */
 	file->nbytes = FileRead(thisfile,
 							file->buffer.data,
-							sizeof(file->buffer),
+							sizeof(file->buffer.data),
 							file->curOffset,
 							WAIT_EVENT_BUFFILE_READ);
 	if (file->nbytes < 0)