diff --git a/packages/jest-transform/src/ScriptTransformer.ts b/packages/jest-transform/src/ScriptTransformer.ts
index 1f7506b7af0e..ddd3facadebe 100644
--- a/packages/jest-transform/src/ScriptTransformer.ts
+++ b/packages/jest-transform/src/ScriptTransformer.ts
@@ -658,17 +658,17 @@ const calcIgnorePatternRegExp = (config: Config.ProjectConfig) => {
   return new RegExp(config.transformIgnorePatterns.join('|'));
 };
 
-const calcTransformRegExp = (config: Config.ProjectConfig) => {
-  if (!config.transform.length) {
+const calcTransformRegExp = ({transform = []}: Config.ProjectConfig) => {
+  if (!transform.length) {
     return undefined;
   }
 
   const transformRegexp: Array<[RegExp, string, Record<string, unknown>]> = [];
-  for (let i = 0; i < config.transform.length; i++) {
+  for (let i = 0; i < transform.length; i++) {
     transformRegexp.push([
-      new RegExp(config.transform[i][0]),
-      config.transform[i][1],
-      config.transform[i][2],
+      new RegExp(transform[i][0]),
+      transform[i][1],
+      transform[i][2],
     ]);
   }