diff --git a/sklarpy/copulas/_prefit_dists.py b/sklarpy/copulas/_prefit_dists.py
index b7e1d4a..d1ea764 100644
--- a/sklarpy/copulas/_prefit_dists.py
+++ b/sklarpy/copulas/_prefit_dists.py
@@ -802,7 +802,8 @@ def copula_rvs(self, size: int, copula_params: Union[Params, tuple],
         """
         max_num_loops: int = 100
         num_loops: int = 0
-        d: int = self._mv_object._get_dim(copula_params)
+        d: int = self._mv_object._get_dim(
+            self._mv_object._get_params(copula_params))
         valid_copula_rvs: deque = deque()
         while size > 0:
             # generating random variables from multivariate distribution
@@ -820,7 +821,6 @@ def copula_rvs(self, size: int, copula_params: Union[Params, tuple],
             # repeating until sample size reached
             size -= copula_rvs.shape[0]
             num_loops += 1
-
             if num_loops > max_num_loops:
                 raise ArithmeticError(f"Unable to generate valid copula rvs. "
                                       f"number of retries reached "