diff --git a/libappstream-glib.spec b/libappstream-glib.spec
index d527daf..3c24869 100644
--- a/libappstream-glib.spec
+++ b/libappstream-glib.spec
@@ -21,6 +21,7 @@ BuildRequires: intltool
 # for the builder component
 BuildRequires: fontconfig-devel
 BuildRequires: freetype-devel
+BuildRequires: gtk3-devel
 BuildRequires: pango-devel
 BuildRequires: rpm-devel
 BuildRequires: sqlite-devel