diff --git a/var/spack/repos/builtin/packages/gts/package.py b/var/spack/repos/builtin/packages/gts/package.py
index d02a5d4de8..eb50d0c416 100644
--- a/var/spack/repos/builtin/packages/gts/package.py
+++ b/var/spack/repos/builtin/packages/gts/package.py
@@ -27,3 +27,4 @@ class Gts(AutotoolsPackage):
     version("121130", sha256="c23f72ab74bbf65599f8c0b599d6336fabe1ec2a09c19b70544eeefdc069b73b")
 
     depends_on("glib")
+    depends_on("pkgconfig", type=("build"))