diff --git a/dist/index.js b/dist/index.js
index 8450185..dc198f1 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -66,7 +66,7 @@ function getInputs() {
         tagSchedule: core.getInput('tag-schedule') || 'nightly',
         tagCustom: getInputList('tag-custom'),
         tagCustomOnly: /true/i.test(core.getInput('tag-custom-only') || 'false'),
-        labelCustom: getInputList('label-custom'),
+        labelCustom: getInputList('label-custom', true),
         sepTags: core.getInput('sep-tags') || `\n`,
         sepLabels: core.getInput('sep-labels') || `\n`,
         githubToken: core.getInput('github-token')
diff --git a/src/context.ts b/src/context.ts
index 3b55c16..acf8cac 100644
--- a/src/context.ts
+++ b/src/context.ts
@@ -44,7 +44,7 @@ export function getInputs(): Inputs {
     tagSchedule: core.getInput('tag-schedule') || 'nightly',
     tagCustom: getInputList('tag-custom'),
     tagCustomOnly: /true/i.test(core.getInput('tag-custom-only') || 'false'),
-    labelCustom: getInputList('label-custom'),
+    labelCustom: getInputList('label-custom', true),
     sepTags: core.getInput('sep-tags') || `\n`,
     sepLabels: core.getInput('sep-labels') || `\n`,
     githubToken: core.getInput('github-token')