diff --git a/bin/stats/site_variant_readers.py b/bin/stats/site_variant_readers.py
index f352a59..ac0f243 100644
--- a/bin/stats/site_variant_readers.py
+++ b/bin/stats/site_variant_readers.py
@@ -191,7 +191,7 @@ def parse_strand(self) -> int:
             case _:
                 raise Exception(f"Invalid strand value: {strand_str}")
 
-class Jacusa2Reader():
+class Jacusa2Reader(RNAVariantReader):
     def __init__(self, file_handle: TextIO) -> None:
         self.file_handle: TextIO = file_handle
 
@@ -220,7 +220,7 @@ def read(self) -> Optional[SiteVariantData]:
             case '+':
                 strand = 1
             case '-':
-                strand -1
+                strand = -1
 
         frequencies=np.int32(parts[JACUSA_FIELDS_INDEX["bases11"]].split(',') + [0])