diff --git a/setup.py b/setup.py
index 64a03e5..c268ba4 100644
--- a/setup.py
+++ b/setup.py
@@ -45,10 +45,10 @@ def setup_package_pyscaffold():
 #                         include_dirs=['wafo/source/rind2007'])
 #    extensions.append(mreg_ext)
 
-#    mvn_ext = Extension('wafo.mvn',
-#                        sources=['wafo/source/mvn/mvn.pyf',
-#                                 'wafo/source/mvn/mvndst.f'])
-#    extensions.append(mvn_ext)
+    mvn_ext = Extension('wafo.mvn',
+                        sources=['wafo/source/mvn/mvn.pyf',
+                                 'wafo/source/mvn/mvndst.f'])
+    extensions.append(mvn_ext)
 
 #    mvnprd_ext = Extension('wafo.mvnprdmod',
 #                           sources=['wafo/source/mvnprd/mvnprd.f',