diff --git a/README.md b/README.md
index ef187f2..7697d34 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,6 @@ import LambdaEnvVars from 'lambda-env-vars';
 const lambdaEnvVars = new LambdaEnvVars({
   location: 's3',
   s3Config: {
-    region: 'eu-west-2',
     bucketName: 'my-env-var-bucket',
     fileName: 'my-env-var-filename.json',
   },
@@ -107,7 +106,6 @@ Optionally the source of environment variables can be a JSON file within an S3 b
   location: 's3',
   s3Config: {
     bucketName: 'name-of-bucket',
-    bucketRegion 'eu-west-2',
     fileName: 'filename.json', // Name of the JSON file containing the env vars
   },
 }
@@ -120,7 +118,6 @@ The available attributes of the params object are as follows:
 | location | string | 'lambdaConfig' | Can be 'lambdaConfig' or 's3'. The location the environment variables are stored.
 | s3Config | object | {} | Required when location is equal to 's3'. Fields that specify the location of the env var JSON file |
 | s3Config.bucketName | string | | The name of the bucket containing the env var file. |
-| s3Config.bucketRegion | string | | The region of the bucket. |
 | s3Config.fileName | string | | The file name of the env var JSON file. |
 
 
diff --git a/src/index.js b/src/index.js
index 2b55846..27af57c 100644
--- a/src/index.js
+++ b/src/index.js
@@ -18,7 +18,6 @@ export default class LambdaEnvVars {
    * Config used to get the an env var file from S3.
    *
    * @param {string} params.s3Config.bucketName
-   * @param {string} params.s3Config.bucketRegion
    * @param {string} params.s3Config.fileName
    *
    * @return {Object}
@@ -72,7 +71,6 @@ export default class LambdaEnvVars {
    * Config used to get the an env var file from S3.
    *
    * @param {string} params.s3Config.bucketName
-   * @param {string} params.s3Config.bucketRegion
    * @param {string} params.s3Config.fileName
    *
    * @return {Promise}
@@ -83,7 +81,7 @@ export default class LambdaEnvVars {
     return this.buildParams(params)
       .then((builtParams) => {
         if (builtParams.location === 's3') {
-          return this.getVarFromS3File(variableName, params.s3Config);
+          return this.getVarFromS3File(variableName, builtParams.s3Config);
         }
 
         if (this.decryptedVariables[variableName]) {
@@ -112,14 +110,13 @@ export default class LambdaEnvVars {
    * Promise that resolves the variable name
    */
   getVarFromS3File(variableName, s3Config) {
-    const fileKey = s3Config.bucketRegion + s3Config.bucketName + s3Config.fileName;
+    const fileKey = s3Config.bucketName + s3Config.fileName;
 
     if (this.s3Vars[fileKey]) {
       return Promise.resolve(this.s3Vars[fileKey][variableName]);
     }
 
     const s3Params = {
-      region: s3Config.bucketRegion,
       Key: s3Config.fileName,
       Bucket: s3Config.bucketName,
     };
@@ -163,11 +160,10 @@ export default class LambdaEnvVars {
         (
           !params.s3Config ||
           !params.s3Config.bucketName ||
-          !params.s3Config.bucketRegion ||
           !params.s3Config.fileName
         )
     ) {
-      const errorMessage = 's3Config.bucketName, s3Config.bucketRegion, s3Config.fileName are required when location is \'s3\'';
+      const errorMessage = 's3Config.bucketName and s3Config.fileName are required when location is \'s3\'';
       return Promise.reject(new Error(errorMessage));
     }
 
diff --git a/test/index.js b/test/index.js
index 77a98aa..9dd25b3 100644
--- a/test/index.js
+++ b/test/index.js
@@ -99,14 +99,12 @@ test('Getting custom vars, uses s3 when the location is specified', (t) => {
   const params = {
     location: 's3',
     s3Config: {
-      bucketRegion: 'eu-west-1',
       bucketName: 'bucketName',
       fileName: 'file-name-4.json',
     },
   };
 
-  const storedVarKey = params.s3Config.bucketRegion + params.s3Config.bucketName +
-    params.s3Config.fileName;
+  const storedVarKey = params.s3Config.bucketName + params.s3Config.fileName;
 
   lambdaEnvVars.s3Vars[storedVarKey] = { variableName: 'value' };
 
@@ -186,22 +184,6 @@ test('Building request params: Rejects when s3Config is missing bucketName', (t)
   const params = {
     location: 's3',
     s3Config: {
-      bucketRegion: 'bucketRegion',
-      fileName: 'fileName',
-    },
-  };
-
-  return lambdaEnvVars.buildParams(params)
-    .catch((error) => {
-      t.is(typeof error.message, 'string');
-    });
-});
-
-test('Building request params: Rejects when s3Config is missing bucketRegion', (t) => {
-  const params = {
-    location: 's3',
-    s3Config: {
-      bucketName: 'bucketName',
       fileName: 'fileName',
     },
   };
@@ -217,7 +199,6 @@ test('Building request params: Rejects when s3Config is missing fileName', (t) =
     location: 's3',
     s3Config: {
       bucketName: 'bucketName',
-      bucketRegion: 'bucketRegion',
     },
   };
 
@@ -232,7 +213,6 @@ test('Building request params: Resolves the params object', (t) => {
     location: 's3',
     s3Config: {
       bucketName: 'bucketName',
-      bucketRegion: 'bucketRegion',
       fileName: 'fileName',
     },
   };
@@ -255,13 +235,11 @@ test(
   'Getting var from s3 file: Resolves undefined when the file is stored but variable is undefined',
   (t) => {
     const defaultS3Config = {
-      bucketRegion: 'eu-west-1',
       fileName: 'file-name-1.json',
       bucketName: 'bucketName',
     };
 
-    const storedVarKey = defaultS3Config.bucketRegion + defaultS3Config.bucketName +
-      defaultS3Config.fileName;
+    const storedVarKey = defaultS3Config.bucketName + defaultS3Config.fileName;
 
     lambdaEnvVars.s3Vars[storedVarKey] = {};
 
@@ -274,13 +252,11 @@ test(
 
 test('Getting var from s3 file: Resolves var when the file is stored', (t) => {
   const defaultS3Config = {
-    bucketRegion: 'eu-west-1',
     bucketName: 'bucketName',
     fileName: 'file-name-2.json',
   };
 
-  const storedVarKey = defaultS3Config.bucketRegion + defaultS3Config.bucketName +
-    defaultS3Config.fileName;
+  const storedVarKey = defaultS3Config.bucketName + defaultS3Config.fileName;
 
   lambdaEnvVars.s3Vars[storedVarKey] = { variableName: 'value' };
 
@@ -292,7 +268,6 @@ test('Getting var from s3 file: Resolves var when the file is stored', (t) => {
 
 test('Getting var from s3 file: Rejects when the s3 file is not valid json', (t) => {
   const defaultS3Config = {
-    bucketRegion: 'eu-west-1',
     fileName: 'invalid-json.json',
     bucketName: 'bucketName',
   };
@@ -305,7 +280,6 @@ test('Getting var from s3 file: Rejects when the s3 file is not valid json', (t)
 
 test('Getting var from s3 file: Resolves the file once fetched from S3', (t) => {
   const defaultS3Config = {
-    bucketRegion: 'eu-west-1',
     fileName: 'file-name-3.json',
     bucketName: 'bucketName',
   };