diff --git a/README.md b/README.md
index c69db4141edd..dbe428ccd67a 100644
--- a/README.md
+++ b/README.md
@@ -116,7 +116,7 @@ then modify your `package.json` so the `jest` section looks something like:
 {
   "jest": {
     "transform": {
-      ".(ts|tsx)": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+      "^.+\\.tsx?$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
     },
     "testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
     "moduleFileExtensions": [
diff --git a/docs/en/GettingStarted.md b/docs/en/GettingStarted.md
index 5c17474e764e..b2dbea7fd0df 100644
--- a/docs/en/GettingStarted.md
+++ b/docs/en/GettingStarted.md
@@ -120,7 +120,7 @@ then modify your `package.json` so the `jest` section looks something like:
 {
   "jest": {
     "transform": {
-      ".(ts|tsx)": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+      "^.+\\.tsx?$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
     },
     "testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
     "moduleFileExtensions": [