diff --git a/dist/index.js b/dist/index.js
index 79a431d..06d16f9 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -4248,9 +4248,9 @@ function getImageID() {
 exports.getImageID = getImageID;
 function getSecret(kvp) {
     return __awaiter(this, void 0, void 0, function* () {
-        const sepIndex = kvp.indexOf('=');
-        const key = kvp.substr(0, sepIndex);
-        const value = kvp.substr(sepIndex + 1);
+        const delimiterIndex = kvp.indexOf('=');
+        const key = kvp.substring(0, delimiterIndex);
+        const value = kvp.substring(delimiterIndex + 1);
         const secretFile = context.tmpNameSync({
             tmpdir: context.tmpDir()
         });