diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index 0ccef6a5e59..8ff8281d5e5 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -756,7 +756,7 @@ def dag_hash(self, length=None):
         """
         yaml_text = yaml.dump(
             self.to_node_dict(), default_flow_style=True, width=sys.maxint)
-        print yaml_text
+#        print yaml_text
         sha = hashlib.sha1(yaml_text)
         return base64.b32encode(sha.digest()).lower()[:length]