diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 7af601247dbd5ec8a95fcfa3d4aab51809d0b569..6d7858a37c0b25136082c43095ec8215c33afbe9 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -217,6 +217,7 @@ LIBBPF_API bool bpf_program__autoload(const struct bpf_program *prog);
 LIBBPF_API int bpf_program__set_autoload(struct bpf_program *prog, bool autoload);
 
 /* returns program size in bytes */
+LIBBPF_DEPRECATED_SINCE(0, 7, "use bpf_program__insn_cnt() instead")
 LIBBPF_API size_t bpf_program__size(const struct bpf_program *prog);
 
 struct bpf_insn;