diff --git a/var/spack/repos/builtin/packages/xrootd/package.py b/var/spack/repos/builtin/packages/xrootd/package.py
index 2514997f88a..16a17878833 100644
--- a/var/spack/repos/builtin/packages/xrootd/package.py
+++ b/var/spack/repos/builtin/packages/xrootd/package.py
@@ -40,3 +40,4 @@ class Xrootd(CMakePackage):
 
     depends_on('cmake@2.6:', type='build')
     depends_on('zlib')
+    depends_on('openssl')