diff --git a/src/lib/log/log.c b/src/lib/log/log.c
index 56f016eae4..012e25193e 100644
--- a/src/lib/log/log.c
+++ b/src/lib/log/log.c
@@ -526,7 +526,7 @@ logfile_deliver(logfile_t *lf, const char *buf, size_t msg_len,
      * pass them, and some very old ones do not detect overflow so well.
      * Regrettably, they call their maximum line length MAXLINE. */
 #if MAXLINE < 64
-#warn "MAXLINE is a very low number; it might not be from syslog.h after all"
+#warning "MAXLINE is a very low number; it might not be from syslog.h."
 #endif
     char *m = msg_after_prefix;
     if (msg_len >= MAXLINE)
diff --git a/src/lib/malloc/map_anon.c b/src/lib/malloc/map_anon.c
index 0f6a4150c7..4e38cb642c 100644
--- a/src/lib/malloc/map_anon.c
+++ b/src/lib/malloc/map_anon.c
@@ -75,8 +75,8 @@
 #endif /* defined(HAVE_MINHERIT) || ... */
 
 #if defined(HAVE_MINHERIT) && !defined(FLAG_ZERO) && !defined(FLAG_NOINHERIT)
-#warn "minherit() is defined, but we couldn't find the right flag for it."
-#warn "This is probably a bug in Tor's support for this platform."
+#warning "minherit() is defined, but we couldn't find the right flag for it."
+#warning "This is probably a bug in Tor's support for this platform."
 #endif
 
 /**