diff --git a/desktop/src/pubscript-desktop.c b/desktop/src/pubscript-desktop.c
index 41dc85e..e7132a5 100644
--- a/desktop/src/pubscript-desktop.c
+++ b/desktop/src/pubscript-desktop.c
@@ -6,6 +6,7 @@
  * the full PubScript studio inside a native GTK3 + WebKit2GTK 4.1 window with
  * persistent IndexedDB and localStorage in ~/.local/share/pubscript/webdata.
  */
+#define _DEFAULT_SOURCE
 #define _POSIX_C_SOURCE 200809L
 #include <gtk/gtk.h>
 #include <dlfcn.h>