diff --git a/src/init.c b/src/init.c
index 8fee786ae..e5f804b47 100644
--- a/src/init.c
+++ b/src/init.c
@@ -116,6 +116,7 @@ static void PreserveObjects(void) {
   Rf_classgets(nano_unresolved, Rf_mkString("unresolvedValue"));
 }
 
+// # nocov start
 static void ReleaseObjects(void) {
   R_ReleaseObject(nano_unresolved);
   R_ReleaseObject(nano_success);
@@ -129,6 +130,7 @@ static void ReleaseObjects(void) {
   R_ReleaseObject(nano_aioFuncs);
   R_ReleaseObject(nano_aioFormals);
 }
+// # nocov end
 
 static const R_CallMethodDef callMethods[] = {
   {"rnng_aio_call", (DL_FUNC) &rnng_aio_call, 1},
@@ -219,6 +221,8 @@ void attribute_visible R_init_nanonext(DllInfo* dll) {
   R_forceSymbols(dll, TRUE);
 }
 
+// # nocov start
 void attribute_visible R_unload_nanonext(DllInfo *info) {
   ReleaseObjects();
 }
+// # nocov end
diff --git a/tests/tests.R b/tests/tests.R
index bb61fbbe7..55e7b0017 100644
--- a/tests/tests.R
+++ b/tests/tests.R
@@ -522,6 +522,7 @@ nanotest(is.environment(set_promise_context(new.env(), new.env())))
 
 nanotest(base64enc("test") == "dGVzdA==")
 nanotest(base64dec(base64enc("test")) == "test")
+nanotest(is.character(base64enc(c("vector", "test"))))
 nanotest(is.raw(base64enc(data.frame(), convert = FALSE)))
 nanotest(is.raw(base64dec(base64enc(as.raw(c(1L, 2L)), convert = FALSE), convert = FALSE)))
 nanotest(is.integer(base64dec(base64enc(c(1L, 2L)), convert = NA)))