diff --git a/textproc/atom/files/patch-msg.c b/textproc/atom/files/patch-msg.c
new file mode 100644
index 000000000000..b03304be69a0
--- /dev/null
+++ b/textproc/atom/files/patch-msg.c
@@ -0,0 +1,14 @@
+--- msg.c.orig	2023-03-07 22:52:52 UTC
++++ msg.c
+@@ -194,11 +194,7 @@ parse_preface(const char *template) {
+         fmt[p++] = *template;
+         if (state == percent) {
+             if (*template == 's')
+-#if defined(_POSIX_SOURCE)
+                 p += sprintf(fmt + p - 2, "%d", msg_severity) - 2;
+-#else
+-                p = strchr(sprintf(fmt + p - 2, "%d", msg_severity), 0) - fmt;
+-#endif
+             state = normal;
+         } else if (*template == '%')
+             state = percent;