diff --git a/freebarcodes/decode.py b/freebarcodes/decode.py
index 6945272..eba5355 100644
--- a/freebarcodes/decode.py
+++ b/freebarcodes/decode.py
@@ -91,6 +91,7 @@ def build_codebook_from_random_codewords(self, codewords, max_err_decode, max_er
                         self.max_err_detect,
                         self.max_err_decode,
                         )
+                    )
 
             # Iterate detect spheres, rejecting conflicts
             for i, cw in enumerate(self._codewords):