diff --git a/tests/cpputest/unittests/testsSerialization.cpp b/tests/cpputest/unittests/testsSerialization.cpp
index 0b63c89692..31ea2c965f 100644
--- a/tests/cpputest/unittests/testsSerialization.cpp
+++ b/tests/cpputest/unittests/testsSerialization.cpp
@@ -95,8 +95,8 @@ void checkReturnDataEqual(amici::ReturnData const& r, amici::ReturnData const& s
     CHECK_EQUAL(*r.chi2, *s.chi2);
     CHECK_EQUAL(*r.status, *s.status);
 
-    checkEqualArray(r.sllh, s.sllh, r.nplist, 1e-8, 1e-8, "sllh");
-    checkEqualArray(r.s2llh, s.s2llh, r.nplist * r.nplist, 1e-8, 1e-8, "s2llh");
+    checkEqualArray(r.sllh, s.sllh, r.nplist, 1e-5, 1e-5, "sllh");
+    checkEqualArray(r.s2llh, s.s2llh, r.nplist * r.nplist, 1e-5, 1e-5, "s2llh");
 }