diff --git a/src/backend/storage/file/buffile.c b/src/backend/storage/file/buffile.c
index a4be5fe5135..2afbe907ac5 100644
--- a/src/backend/storage/file/buffile.c
+++ b/src/backend/storage/file/buffile.c
@@ -434,7 +434,7 @@ BufFileLoadBuffer(BufFile *file)
 	thisfile = file->files[file->curFile];
 	file->nbytes = FileRead(thisfile,
 							file->buffer.data,
-							sizeof(file->buffer),
+							sizeof(file->buffer.data),
 							file->curOffset,
 							WAIT_EVENT_BUFFILE_READ);
 	if (file->nbytes < 0)