diff --git a/lib/spack/spack/__init__.py b/lib/spack/spack/__init__.py
index 3051d3f7427..920e22d672a 100644
--- a/lib/spack/spack/__init__.py
+++ b/lib/spack/spack/__init__.py
@@ -173,7 +173,7 @@
 #       should live.  This file is overloaded for spack core vs. for packages.
 #
 __all__ = ['Package', 'Version', 'when', 'ver']
-from spack.package import Package, ExtensionConflictError
+from spack.package import Package, CMakePackage, ExtensionConflictError
 from spack.version import Version, ver
 from spack.multimethod import when