diff --git a/src/libbpf_internal.h b/src/libbpf_internal.h
index 98333a6..e4d0566 100644
--- a/src/libbpf_internal.h
+++ b/src/libbpf_internal.h
@@ -544,8 +544,10 @@ static inline int ensure_good_fd(int fd)
 		saved_errno = errno;
 		close(old_fd);
 		errno = saved_errno;
-		if (fd < 0)
+		if (fd < 0) {
 			pr_warn("failed to dup FD %d to FD > 2: %d\n", old_fd, -saved_errno);
+			errno = saved_errno;
+		}
 	}
 	return fd;
 }