diff --git a/milc/_sparkline.py b/milc/_sparkline.py
index 5518db9..18ebe43 100644
--- a/milc/_sparkline.py
+++ b/milc/_sparkline.py
@@ -103,7 +103,7 @@ def sparkline(
         if int_range == 0:
             spark_int = 0
         else:
-            spark_int = (i-min_value) / int_range * 8  # type: ignore[operator]
+            spark_int = (i-min_value) / int_range * 8  # type: ignore[operator,assignment]
 
         if spark_int > 7:
             spark_int = 7