diff --git a/src/libsysprof-capture/sysprof-capture-writer.c b/src/libsysprof-capture/sysprof-capture-writer.c
index 5d8b38aa..8e4c5a61 100644
--- a/src/libsysprof-capture/sysprof-capture-writer.c
+++ b/src/libsysprof-capture/sysprof-capture-writer.c
@@ -488,7 +488,17 @@ sysprof_capture_writer_new_from_fd (int   fd,
   self->next_counter_id = 1;
 
   now = g_date_time_new_now_local ();
+
+#if GLIB_CHECK_VERSION(2, 62, 0)
   nowstr = g_date_time_format_iso8601 (now);
+#else
+  {
+    GTimeVal tv;
+
+    g_date_time_to_timeval (now, &tv);
+    nowstr = g_time_val_to_iso8601 (&tv);
+  }
+#endif
 
   header = sysprof_capture_writer_allocate (self, &header_len);