diff --git a/var/spack/repos/builtin/packages/cradl/package.py b/var/spack/repos/builtin/packages/cradl/package.py
index 59868e5230a..2f42736d97d 100644
--- a/var/spack/repos/builtin/packages/cradl/package.py
+++ b/var/spack/repos/builtin/packages/cradl/package.py
@@ -15,6 +15,8 @@ class Cradl(Package):
     url      = "https://github.com/LLNL/CRADL/archive/master.zip"
     git      = "https://github.com/LLNL/CRADL.git"
 
+    tags = ['proxy-app']
+
     version('master', branch='master')
 
     depends_on('py-pandas')