diff --git a/base.py b/base.py
index 7794f4b..4a2a41e 100644
--- a/base.py
+++ b/base.py
@@ -111,7 +111,7 @@ class BaseWindow(QMainWindow):
             print("date_str", date_str, flush=True)
 
             def extract_and_attach(i, nfig, name, canvas_base="Canvas"):
-                canvas = '{0} {0}'.format(canvas_base, i+1)
+                canvas = '{0} {1}'.format(canvas_base, i+1)
                 name_base = name.replace(' ', '_').lower()
 
                 if self.all_data['Figure data'][canvas] is not None: