diff --git a/api/s2_junctions.py b/api/s2_junctions.py
index c8be1c1..9aa2935 100644
--- a/api/s2_junctions.py
+++ b/api/s2_junctions.py
@@ -162,7 +162,7 @@ def set_junction_pattern(name: str, id: str, pattern: str) -> ChangeSet:
         add_operation(name, redo, undo)
 
     change = ChangeSet()
-    change.update('junction', id, 'pattern', 'float', str(pattern))
+    change.update('junction', id, 'pattern', 'str', str(pattern))
     return change