diff --git a/R/zzz.R b/R/zzz.R
new file mode 100644
index 0000000..a7b599d
--- /dev/null
+++ b/R/zzz.R
@@ -0,0 +1,3 @@
+.onUnload <- function(libpath) {
+  library.dynam.unload("cpr", libpath)
+}