diff --git a/libxfce4windowing/meson.build b/libxfce4windowing/meson.build
index b1a020b..fcb1b12 100644
--- a/libxfce4windowing/meson.build
+++ b/libxfce4windowing/meson.build
@@ -144,6 +144,7 @@ pkgconfig.generate(
   name: libxfce4windowing_pkgname,
   filebase: libxfce4windowing_pkgname,
   description: 'X11/Wayland windowing utility library for Xfce',
+  requires: ['gtk+-3.0'],
   subdirs: ['xfce4' / libxfce4windowing_pkgname],
   install_dir: get_option('prefix') / get_option('libdir') / 'pkgconfig',
 )
diff --git a/libxfce4windowingui/meson.build b/libxfce4windowingui/meson.build
index 68aa909..f56c3c1 100644
--- a/libxfce4windowingui/meson.build
+++ b/libxfce4windowingui/meson.build
@@ -76,6 +76,7 @@ pkgconfig.generate(
   name: libxfce4windowingui_pkgname,
   filebase: libxfce4windowingui_pkgname,
   description: 'X11/Wayland windowing utility library for Xfce - extra widgets',
+  requires: ['gtk+-3.0'],
   subdirs: ['xfce4' / libxfce4windowing_pkgname],
   install_dir: get_option('prefix') / get_option('libdir') / 'pkgconfig',
 )