diff --git a/poky/meta/recipes-gnome/gcr/gcr_3.40.0.bb b/poky/meta/recipes-gnome/gcr/gcr_3.40.0.bb
index 0c2af42..917be59 100644
--- a/poky/meta/recipes-gnome/gcr/gcr_3.40.0.bb
+++ b/poky/meta/recipes-gnome/gcr/gcr_3.40.0.bb
@@ -13,6 +13,8 @@
 
 CACHED_CONFIGUREVARS += "ac_cv_path_GPG='gpg2'"
 
+CFLAGS += "-D_GNU_SOURCE"
+
 GNOMEBASEBUILDCLASS = "meson"
 GTKDOC_MESON_OPTION = "gtk_doc"
 inherit gnomebase gtk-icon-cache gtk-doc features_check upstream-version-is-even vala gobject-introspection gettext mime mime-xdg