diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index e2d8c17f2e8556279605c267a54dddf2310cc829..eee883f007f9e24cb4c742422b3697b3fae8183c 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -118,7 +118,9 @@ struct bpf_object_open_opts {
 	 * auto-pinned to that path on load; defaults to "/sys/fs/bpf".
 	 */
 	const char *pin_root_path;
-	long :0;
+
+	__u32 :32; /* stub out now removed attach_prog_fd */
+
 	/* Additional kernel config content that augments and overrides
 	 * system Kconfig for CONFIG_xxx externs.
 	 */