diff --git a/NAMESPACE b/NAMESPACE
index 4051ad3..324fd5f 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -3,6 +3,7 @@
 export(crps_weights)
 export(mixture_from_samples)
 import(Rcpp)
+import(methods)
 importFrom(RcppParallel,RcppParallelLibs)
 importFrom(data.table,.SD)
 importFrom(data.table,`:=`)
@@ -11,4 +12,5 @@ importFrom(data.table,setDT)
 importFrom(data.table,setnames)
 importFrom(rstan,optimizing)
 importFrom(rstan,sampling)
+importFrom(rstantools,rstan_config)
 useDynLib(stackr, .registration = TRUE)
diff --git a/R/stackr-package.R b/R/stackr-package.R
index fa57db0..c92daef 100644
--- a/R/stackr-package.R
+++ b/R/stackr-package.R
@@ -21,7 +21,9 @@
 #' @aliases stackr
 #' @useDynLib stackr, .registration = TRUE
 #' @import Rcpp
+#' @import methods
 #' @importFrom rstan sampling
+#' @importFrom rstantools rstan_config
 #' @importFrom RcppParallel RcppParallelLibs
 #'
 #' @references
diff --git a/configure b/configure
index 1c04798..0304fc5 100755
--- a/configure
+++ b/configure
@@ -1,4 +1,5 @@
+#! /bin/sh
+
 # Generated by rstantools.  Do not edit by hand.
 
-#! /bin/sh
 "${R_HOME}/bin/Rscript" -e "rstantools::rstan_config()"
diff --git a/configure.win b/configure.win
index 94d77bd..5e2dceb 100755
--- a/configure.win
+++ b/configure.win
@@ -1,4 +1,5 @@
+#! /bin/sh
+
 # Generated by rstantools.  Do not edit by hand.
 
-#! /bin/sh
 "${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" -e "rstantools::rstan_config()"