diff --git a/DESCRIPTION b/DESCRIPTION
index 0bb68fc..53e40bb 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -18,6 +18,7 @@ Imports:
     dplyr,
     lubridate,
     magrittr,
+    memoise,
     purrr,
     rlang,
     scoringRules,
diff --git a/R/zzz.R b/R/zzz.R
new file mode 100644
index 0000000..065a123
--- /dev/null
+++ b/R/zzz.R
@@ -0,0 +1,3 @@
+.onLoad <- function(libname, pkgname) {
+  get_local_rows <<- memoise::memoise(get_local_rows, omit_args = c(".datetime"))
+}