diff --git a/pyerrors/fits.py b/pyerrors/fits.py
index 0bf7723c..f97665c8 100644
--- a/pyerrors/fits.py
+++ b/pyerrors/fits.py
@@ -486,7 +486,7 @@ def _standard_fit(x, y, func, silent=False, **kwargs):
         condn = np.linalg.cond(corr)
         if condn > 0.1 / np.finfo(float).eps:
             raise Exception(f"Cannot invert correlation matrix as its condition number exceeds machine precision ({condn:1.2e})")
-        if condn > 1 / np.sqrt(np.finfo(float).eps):
+        if condn > 1e13:
             warnings.warn("Correlation matrix may be ill-conditioned, condition number: {%1.2e}" % (condn), RuntimeWarning)
         chol = np.linalg.cholesky(corr)
         chol_inv = scipy.linalg.solve_triangular(chol, covdiag, lower=True)