diff --git a/rowers/opaque.py b/rowers/opaque.py
index 949572d9..0927df99 100644
--- a/rowers/opaque.py
+++ b/rowers/opaque.py
@@ -54,7 +54,7 @@ class OpaqueEncoder:
 
     def decode_hex(self, s):
         """Decode an 8-character hex string, returning the original integer."""
-        return self.transcode(int(s, 16))
+        return self.transcode(int(str(s), 16))
 
     def decode_base64(self, s):
         """Decode a 6-character base64 string, returning the original integer."""
diff --git a/rowers/tests/testdata/testdata.csv.gz b/rowers/tests/testdata/testdata.csv.gz
index 9676956f..dc175d11 100644
Binary files a/rowers/tests/testdata/testdata.csv.gz and b/rowers/tests/testdata/testdata.csv.gz differ