diff --git a/src/main.ts b/src/main.ts
index b841aba..a604cd3 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -39,7 +39,7 @@ async function run(): Promise<void> {
     const protectedBranchNamePattern = core.getInput(
       'protectedBranchNamePattern'
     )
-    let prRunsContextOrder = core.getInput('prChecksFetchOrder')
+    const prRunsContextOrder = core.getInput('prChecksFetchOrder')
     switch (prRunsContextOrder) {
       case 'first':
       case 'last':