diff --git a/var/spack/repos/builtin/packages/gtksourceview/package.py b/var/spack/repos/builtin/packages/gtksourceview/package.py
index 68a0ee13487..45a0926a69c 100644
--- a/var/spack/repos/builtin/packages/gtksourceview/package.py
+++ b/var/spack/repos/builtin/packages/gtksourceview/package.py
@@ -42,6 +42,14 @@ def url_for_version(self, version):
         url += '{0}/gtksourceview-{1}.tar.xz'
         return url.format(version.up_to(2), version)
 
+    def setup_dependent_environment(self, spack_env, run_env, dependent_spec):
+        spack_env.prepend_path("XDG_DATA_DIRS", self.prefix.share)
+        run_env.prepend_path("XDG_DATA_DIRS", self.prefix.share)
+
+    def setup_environment(self, spack_env, run_env):
+        spack_env.prepend_path("XDG_DATA_DIRS", self.prefix.share)
+        run_env.prepend_path("XDG_DATA_DIRS", self.prefix.share)
+
     # TODO: If https://github.com/spack/spack/pull/12344 is merged, this
     # method is unnecessary.
     def autoreconf(self, spec, prefix):