diff --git a/src/backend/storage/file/buffile.c b/src/backend/storage/file/buffile.c
index a263875fd5..cd94a5535d 100644
--- a/src/backend/storage/file/buffile.c
+++ b/src/backend/storage/file/buffile.c
@@ -867,8 +867,6 @@ BufFileSize(BufFile *file)
 {
 	int64		lastFileSize;
 
-	Assert(file->fileset != NULL);
-
 	/* Get the size of the last physical file. */
 	lastFileSize = FileSize(file->files[file->numFiles - 1]);
 	if (lastFileSize < 0)