diff --git a/tasks.py b/tasks.py
index e72e3b9..c694d8e 100644
--- a/tasks.py
+++ b/tasks.py
@@ -96,4 +96,4 @@ def tests_run(ctx):
 tests.add_task(tests_createdb, 'createdb')
 tests.add_task(tests_dropdb, 'dropdb')
 tests.add_task(tests_prepare, 'prepare')
-tests.add_task(tests_prepare_config, 'prepare_config')
+tests.add_task(tests_prepare_config, 'prepare-config')
diff --git a/tox.ini b/tox.ini
index 8c0b3ed..c19b6cf 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,7 +12,7 @@ deps =
 whitelist_externals = echo
 commands =
     invoke tests.prepare --version={envname}
-    invoke tests.prepare_config --version={envname} --source={env:SOURCE_CONFIG_FILE} --target={env:OPENERP_SERVER}
+    invoke tests.prepare-config --version={envname} --source={env:SOURCE_CONFIG_FILE} --target={env:OPENERP_SERVER}
     invoke tests.createdb --version={envname}
     py.test {posargs}
 
@@ -27,7 +27,7 @@ deps =
 whitelist_externals = echo
 commands =
     invoke tests.prepare --version={envname}
-    invoke tests.prepare_config --version={envname} --source={env:SOURCE_CONFIG_FILE} --target={env:OPENERP_SERVER}
+    invoke tests.prepare-config --version={envname} --source={env:SOURCE_CONFIG_FILE} --target={env:OPENERP_SERVER}
     invoke tests.createdb --version={envname}
     py.test {posargs}