diff --git a/src/blueprint.py b/src/blueprint.py
index c0d67ab..d11f517 100644
--- a/src/blueprint.py
+++ b/src/blueprint.py
@@ -159,7 +159,7 @@ def _step_in(self, layout, this_step):
             # Keys having values from previous levels are NOT changed.
             elif key not in layout:
                 if key == 'text':
-                    value = '\n'.join(*value)
+                    value = '\n'.join(value)
                 layout[key] = value
 
         # Recursively browse all "next" branches.