diff --git a/src/meson.build b/src/meson.build
index 728cd57a9..38c0a258f 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -8,6 +8,7 @@ pipewire_jack_sources = [
 
 pipewire_jack_c_args = [
   '-DHAVE_CONFIG_H',
+  '-D_GNU_SOURCE',
   '-DPIC',
 ]