diff --git a/lib/spack/spack/test/mock_packages_test.py b/lib/spack/spack/test/mock_packages_test.py
index 0cdf01f1b9b..23b1cf52cc9 100644
--- a/lib/spack/spack/test/mock_packages_test.py
+++ b/lib/spack/spack/test/mock_packages_test.py
@@ -62,7 +62,7 @@
     spec: clang@3.3
     operating_system:
       name: redhat
-      version: '6.7'
+      version: '6'
     paths:
       cc: /path/to/clang
       cxx: /path/to/clang++
@@ -110,7 +110,7 @@
       fc: /path/to/gfortran
     operating_system:
       name: redhat
-      version: '6.7'
+      version: '6'
     spec: gcc@4.5.0
     modules: 'None'
   gcc4.5.0OSX: