diff --git a/scripts/brpy/__init__.py b/scripts/brpy/__init__.py
index 8672416..40756a4 100644
--- a/scripts/brpy/__init__.py
+++ b/scripts/brpy/__init__.py
@@ -58,7 +58,7 @@ def init_brpy(br_loc='/usr/local/lib'):
     br.br_eval.argtypes = _string_args(3)
     br.br_eval.restype = c_float
     br.br_eval_classification.argtypes = _string_args(4)
-    br.br_eval_clustering.argtypes = _string_args(2)
+    br.br_eval_clustering.argtypes = _string_args(3)
     br.br_eval_detection.argtypes = _string_args(3)
     br.br_eval_detection.restype = c_float
     br.br_eval_landmarking.argtypes = _string_args(3) + [c_int, c_int]