diff --git a/src/labeler.ts b/src/labeler.ts
index cd220bd6..3bbe23c2 100644
--- a/src/labeler.ts
+++ b/src/labeler.ts
@@ -15,7 +15,7 @@ export async function run() {
   try {
     const token = core.getInput('repo-token');
     const configPath = core.getInput('configuration-path', {required: true});
-    const syncLabels = core.getBooleanInput('sync-labels', {required: false});
+    const syncLabels = !!core.getBooleanInput('sync-labels', {required: false});
     const dot = !!core.getBooleanInput('dot', {required: false});
 
     const prNumber = getPrNumber();