diff --git a/var/spack/repos/builtin/packages/meep/package.py b/var/spack/repos/builtin/packages/meep/package.py
index 184b6f438ec..603b916da48 100644
--- a/var/spack/repos/builtin/packages/meep/package.py
+++ b/var/spack/repos/builtin/packages/meep/package.py
@@ -83,7 +83,7 @@ def install(self, spec, prefix):
 
         if '+libctl' in spec:
             config_args.append('--with-libctl={0}'.format(
-                spec['libctl'].prefix))
+                join_path(spec['libctl'].prefix.share, 'libctl')))
         else:
             config_args.append('--without-libctl')