diff --git a/src/stcal/ramp_fitting/likely_algo_classes.py b/src/stcal/ramp_fitting/likely_algo_classes.py
index 628fe1a1..2d9e472a 100644
--- a/src/stcal/ramp_fitting/likely_algo_classes.py
+++ b/src/stcal/ramp_fitting/likely_algo_classes.py
@@ -278,6 +278,9 @@ def calc_bias(self, countrates, sig, cvec, da=1e-7):
             Bias of the best-fit count rate from using cvec plus the observed
             resultants to estimate the covariance matrix.
         """
+
+        from .likely_fit import fit_ramps
+
         alpha = countrates[np.newaxis, :] * self.alpha_phnoise[:, np.newaxis]
         alpha += sig**2 * self.alpha_readnoise[:, np.newaxis]
         beta = countrates[np.newaxis, :] * self.beta_phnoise[:, np.newaxis]