diff --git a/var/spack/repos/builtin/packages/relax/package.py b/var/spack/repos/builtin/packages/relax/package.py
index f774c727566..f727017762f 100644
--- a/var/spack/repos/builtin/packages/relax/package.py
+++ b/var/spack/repos/builtin/packages/relax/package.py
@@ -15,9 +15,7 @@ class Relax(CMakePackage):
 
     tags = ['hep']
 
-    # The RELAX project stopped using a fixed release model since it moved to
-    # ROOT 6, so any package checksum is a lie...
-    version('root6')
+    version('root6', sha256='1d24b1a0884bbe99d60f7d02fea45d59695c158ab5e53516ac3fb780eb460bb4')
 
     depends_on('clhep')
     depends_on('gsl')