diff --git a/R/package.R b/R/package.R
index a13a3bcf5..1b2954dfc 100644
--- a/R/package.R
+++ b/R/package.R
@@ -149,7 +149,7 @@ pkg_install_do_plan <- function(proposal) {
 #' ```
 
 pkg_status <- function(pkg, lib = .libPaths()) {
-  stopifnot(length(pkg == 1) && is.character(pkg))
+  stopifnot(length(pkg) > 0 && is.character(pkg))
 
   load_extra("pillar")
   remote(
@@ -208,7 +208,7 @@ pkg_remove_internal <- function(pkg, lib) {
 #' ```
 
 pkg_deps <- function(pkg, upgrade = TRUE, dependencies = NA) {
-  stopifnot(length(pkg) == 1 && is.character(pkg))
+  stopifnot(length(pkg) > 0 && is.character(pkg))
   load_extra("pillar")
   remote(
     function(...) {
@@ -257,7 +257,7 @@ pkg_deps_internal2 <- function(pkg, upgrade, dependencies) {
 #' ```
 
 pkg_deps_tree <- function(pkg, upgrade = TRUE, dependencies = NA) {
-  stopifnot(length(pkg == 1) && is.character(pkg))
+  stopifnot(length(pkg) > 0 && is.character(pkg))
   ret <- remote(
     function(...) {
       get("pkg_deps_tree_internal", asNamespace("pak"))(...)