1 files changed, 2 insertions, 1 deletions

diff --git a/lorry b/lorry
index cbd41ae..1f0580a 100755
--- a/lorry
+++ b/lorry
@@ -413,8 +413,9 @@ class Lorry(cliapp.Application):
         return ''.join('    %s\n' % line for line in string.splitlines())
     
     def dirname(self, project_name):
-        assert '/' not in project_name
         assert '\0' not in project_name
+        # We escape slashes as underscores.
+        project_name = '_'.join(project_name.split('/'))
         return os.path.join(self.settings['working-area'], project_name)
 
     def progress(self, msg):