diff --git a/packages/parser/src/schemas/sqs.ts b/packages/parser/src/schemas/sqs.ts
index 0947fea96a..7c7df01731 100644
--- a/packages/parser/src/schemas/sqs.ts
+++ b/packages/parser/src/schemas/sqs.ts
@@ -41,7 +41,7 @@ const SqsRecordSchema = z.object({
   attributes: SqsAttributesSchema,
   messageAttributes: z.record(z.string(), SqsMsgAttributeSchema),
   md5OfBody: z.string(),
-  md5OfMessageAttributes: z.string().optional().nullable(),
+  md5OfMessageAttributes: z.string().optional(),
   eventSource: z.literal('aws:sqs'),
   eventSourceARN: z.string(),
   awsRegion: z.string(),
diff --git a/packages/parser/tests/events/kinesis/firehose-sqs.json b/packages/parser/tests/events/kinesis/firehose-sqs.json
index a9e36f554d..13ada8dabc 100644
--- a/packages/parser/tests/events/kinesis/firehose-sqs.json
+++ b/packages/parser/tests/events/kinesis/firehose-sqs.json
@@ -6,7 +6,7 @@
     {
       "recordId": "49640912821178817833517986466168945147170627572855734274000000",
       "approximateArrivalTimestamp": 1684864917398,
-      "data": "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"
+      "data": "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"
     }
   ]
 }