diff --git a/R/utilities.R b/R/utilities.R
index 87b9de8a..83245b40 100644
--- a/R/utilities.R
+++ b/R/utilities.R
@@ -194,8 +194,8 @@ samples_median_ci <- function(samples, level = 0.95) {
 decorated_render <- function(...) {
     jinjar::render(
         ...,
-        machine_double_eps = sqrt(.Machine$double.eps),
-        machine_double_neg_eps = sqrt(.Machine$double.neg.eps)
+        machine_double_eps = 0,
+        machine_double_neg_eps = 0
     )
 }
 
diff --git a/tests/testthat/test-SurvivalLoglogistic.R b/tests/testthat/test-SurvivalLoglogistic.R
index db1f4162..fb28f99e 100644
--- a/tests/testthat/test-SurvivalLoglogistic.R
+++ b/tests/testthat/test-SurvivalLoglogistic.R
@@ -16,8 +16,8 @@ test_that("sim_os_loglogistic() is consistant with flexsurv", {
 
 test_that("SurvivalLogLogistic can recover known values", {
 
-    true_a <- 400
-    true_b <- 2
+    true_a <- 300
+    true_b <- 3
     true_beta <- c(0.5, -0.2, 0.1)
     set.seed(837)
 
@@ -38,8 +38,8 @@ test_that("SurvivalLogLogistic can recover known values", {
 
     jm <- JointModel(
         survival = SurvivalLogLogistic(
-            a = prior_lognormal(log(400), 1),
-            b = prior_lognormal(log(2), 1)
+            a = prior_lognormal(log(true_a), 1),
+            b = prior_lognormal(log(true_b), 1)
         )
     )
 
@@ -60,8 +60,8 @@ test_that("SurvivalLogLogistic can recover known values", {
         sampleStanModel(
             jm,
             data = jdat,
-            iter_warmup = 300,
-            iter_sampling = 400,
+            iter_warmup = 350,
+            iter_sampling = 450,
             chains = 1,
             refresh = 0,
             parallel_chains = 1
diff --git a/tests/testthat/test-jinjar_render.R b/tests/testthat/test-jinjar_render.R
index ed49c772..d03c99f1 100644
--- a/tests/testthat/test-jinjar_render.R
+++ b/tests/testthat/test-jinjar_render.R
@@ -23,7 +23,7 @@ test_that("Global variables defined by `decorated_render() are usable", {
         "%d hi there %s and %s",
         5,
         "bob",
-        scales::scientific(sqrt(.Machine$double.eps), digits = 5)
+        0
     )
     expect_equal(observed, expected)
 })