diff --git a/src/introspect.c b/src/introspect.c
index 2a4192d05..b6f774d4a 100644
--- a/src/introspect.c
+++ b/src/introspect.c
@@ -17,8 +17,6 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#define _GNU_SOURCE
-
 #include <errno.h>
 
 #include <spa/param/props.h>
diff --git a/src/meson.build b/src/meson.build
index 88ae3a5e2..d0955941d 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -37,6 +37,7 @@ pipewire_mainloop_glib_sources = [
 
 pipewire_pulseaudio_c_args = [
   '-DHAVE_CONFIG_H',
+  '-D_GNU_SOURCE',
   '-DPIC',
 ]