diff --git a/lib/util/fd.c b/lib/util/fd.c
index 83a196808..6b0d0d554 100644
--- a/lib/util/fd.c
+++ b/lib/util/fd.c
@@ -76,8 +76,7 @@ spdk_fd_get_blocklen(int fd)
 	}
 #endif
 
-	/* Assume 512 if none of the other methods worked */
-	return 512;
+	return 0;
 }
 
 uint64_t