diff --git a/ci/lattice_estimator.sage b/ci/lattice_estimator.sage
index b18836d8a..46aaf9acb 100755
--- a/ci/lattice_estimator.sage
+++ b/ci/lattice_estimator.sage
@@ -62,7 +62,7 @@ def check_security(filename):
             usvp_level = LWE.primal_usvp(param, red_cost_model=model)
             dual_level = LWE.dual_hybrid(param, red_cost_model=model)
 
-            estimator_level = log(min(usvp_level["rop"], dual_level["rop"]), 2)
+            estimator_level = log(min(usvp_level["rop"], dual_level["rop"]), 2).n()
             security_level = f"security level = {estimator_level} bits"
             if estimator_level < SECURITY_LEVEL_THRESHOLD_HARD:
                 print(f"FAIL\t({security_level})")