diff --git a/R/convergence.R b/R/convergence.R
index e3410f7..f76ef94 100644
--- a/R/convergence.R
+++ b/R/convergence.R
@@ -611,6 +611,7 @@ autocovariance <- function(x) {
 autocorrelation <- function(x) {
   ac <- autocovariance(x)
   ac <- ac / ac[1]
+  ac
 }
 
 #' Rank normalization
diff --git a/R/misc.R b/R/misc.R
index c1bce76..02c8df6 100644
--- a/R/misc.R
+++ b/R/misc.R
@@ -238,3 +238,4 @@ has_s3_method <- function(f, signature) {
   }
   FALSE
 }
+