diff --git a/types/aws-lambda/aws-lambda-tests.ts b/types/aws-lambda/aws-lambda-tests.ts
index 3f1598c92e..b9e2a383b6 100644
--- a/types/aws-lambda/aws-lambda-tests.ts
+++ b/types/aws-lambda/aws-lambda-tests.ts
@@ -561,7 +561,7 @@ bool = context.callbackWaitsForEmptyEventLoop;
 str = context.functionName;
 str = context.functionVersion;
 str = context.invokedFunctionArn;
-num = context.memoryLimitInMB;
+str = context.memoryLimitInMB;
 str = context.awsRequestId;
 str = context.logGroupName;
 str = context.logStreamName;
diff --git a/types/aws-lambda/index.d.ts b/types/aws-lambda/index.d.ts
index e5d939c104..a2c6a8ba3f 100644
--- a/types/aws-lambda/index.d.ts
+++ b/types/aws-lambda/index.d.ts
@@ -516,7 +516,7 @@ export interface Context {
     functionName: string;
     functionVersion: string;
     invokedFunctionArn: string;
-    memoryLimitInMB: number;
+    memoryLimitInMB: string;
     awsRequestId: string;
     logGroupName: string;
     logStreamName: string;
diff --git a/types/aws-serverless-express/aws-serverless-express-tests.ts b/types/aws-serverless-express/aws-serverless-express-tests.ts
index f3fd2e71e3..30b6cd354c 100644
--- a/types/aws-serverless-express/aws-serverless-express-tests.ts
+++ b/types/aws-serverless-express/aws-serverless-express-tests.ts
@@ -16,7 +16,7 @@ const mockContext = {
     functionName: 'testFunction',
     functionVersion: '1',
     invokedFunctionArn: 'arn',
-    memoryLimitInMB: 128,
+    memoryLimitInMB: '128',
     awsRequestId: 'id',
     logGroupName: 'group',
     logStreamName: 'stream',