diff --git a/tests/testthat/helpers.R b/tests/testthat/helpers.R
index cd55c2af..ff90097c 100644
--- a/tests/testthat/helpers.R
+++ b/tests/testthat/helpers.R
@@ -654,7 +654,8 @@ check_geweke <- function(
   p_theta,
   p_x_bar_theta,
   niter = 2000,
-  warmup = 1000
+  warmup = 1000,
+  thin = 1
 ) {
   # sample independently
   target_theta <- p_theta(niter)
@@ -670,9 +671,10 @@ check_geweke <- function(
     warmup = warmup
   )
 
-  geweke_checks <- list(target_theta = target_theta,
-       greta_theta = greta_theta)
-
+  geweke_checks <- list(
+    target_theta = do_thinning(target_theta, thin),
+    greta_theta = do_thinning(greta_theta, thin)
+  )
 
   geweke_checks
 
@@ -900,6 +902,12 @@ check_mvn_samples <- function(sampler, n_effective = 3000) {
   errors
 }
 
+do_thinning <- function(x, thinning = 1) {
+  idx <- seq(1, length(x), by = thinning)
+  x[idx]
+}
+
+
 # sample values of greta array 'x' (which must follow a distribution), and
 # compare the samples with iid samples returned by iid_function (which takes the
 # number of arguments as its sole argument), producing a labelled qqplot, and
@@ -928,15 +936,9 @@ check_samples <- function(
   iid_samples <- iid_function(neff)
   mcmc_samples <- as.matrix(draws)
 
-  do_thinning <- function(x, thinning = 1) {
-    idx <- seq(1, length(x), by = thinning)
-    x[idx]
-  }
-
   mcmc_samples <- do_thinning(mcmc_samples, thin)
   iid_samples <- do_thinning(iid_samples, thin)
 
-
   # # plot
   # if (is.null(title)) {
   #   distrib <- get_node(x)$distribution$distribution_name
diff --git a/tests/testthat/test_posteriors_geweke.R b/tests/testthat/test_posteriors_geweke.R
index 9a730f40..8b9868b8 100644
--- a/tests/testthat/test_posteriors_geweke.R
+++ b/tests/testthat/test_posteriors_geweke.R
@@ -41,7 +41,8 @@ test_that("samplers pass geweke tests", {
     model = model,
     data = x,
     p_theta = p_theta,
-    p_x_bar_theta = p_x_bar_theta
+    p_x_bar_theta = p_x_bar_theta,
+    thin = 5
   )
 
   geweke_qq(geweke_hmc, title = "HMC Geweke test")
@@ -56,7 +57,8 @@ test_that("samplers pass geweke tests", {
     data = x,
     p_theta = p_theta,
     p_x_bar_theta = p_x_bar_theta,
-    warmup = 2000
+    warmup = 2000,
+    thin = 5
   )
 
   geweke_qq(geweke_hmc_rwmh, title = "RWMH Geweke test")