diff --git a/ext/DynamicPPLTestExt/sampler.jl b/ext/DynamicPPLTestExt/sampler.jl
index f41b15360..1134d4121 100644
--- a/ext/DynamicPPLTestExt/sampler.jl
+++ b/ext/DynamicPPLTestExt/sampler.jl
@@ -8,7 +8,8 @@
 
 Return the mean of variable represented by `varname` in `chain`.
 """
-DynamicPPL.TestUtils.marginal_mean_of_samples(chain, varname) = mean(Array(chain[Symbol(varname)]))
+DynamicPPL.TestUtils.marginal_mean_of_samples(chain, varname) =
+    mean(Array(chain[Symbol(varname)]))
 
 """
     test_sampler(models, sampler, args...; kwargs...)