diff --git a/include/xo/indentlog/print/function.hpp b/include/xo/indentlog/print/function.hpp
index 095df5c..9a6e56e 100644
--- a/include/xo/indentlog/print/function.hpp
+++ b/include/xo/indentlog/print/function.hpp
@@ -147,7 +147,12 @@ namespace xo {
             /* clang footnote like [CharT = char] instead of [with CharT = char] */
             std::size_t p = s.find(" [");
 #else
+# if (__GNUC__ > 13) || ((__GNUC__ == 13) && (__GNUC_MINOR__ >= 3))
+            /* gcc footnote like [CharT = char] instead of [with CharT = char] starting w/ gcc 13.3 (approximately ?)*/
+            std::size_t p = s.find(" [");
+# else
             std::size_t p = s.find(" [with ");
+# endif
 #endif
 
             return s.substr(0, p);
diff --git a/include/xo/indentlog/timeutil/timeutil.hpp b/include/xo/indentlog/timeutil/timeutil.hpp
index f1b2a93..1a2a024 100644
--- a/include/xo/indentlog/timeutil/timeutil.hpp
+++ b/include/xo/indentlog/timeutil/timeutil.hpp
@@ -259,7 +259,7 @@ namespace xo {
                 auto [t0_tm, t0_usec] = utc_split_tm(t0);
 
                 /* no std::format in clang11 afaict */
-                char usec_buf[8];
+                char usec_buf[15];
                 snprintf(usec_buf, sizeof(usec_buf), "%06d", t0_usec);