diff --git a/specification/storage/Microsoft.BlobStorage/client.tsp b/specification/storage/Microsoft.BlobStorage/client.tsp
index dfed9d07ef75..cee78cdfe098 100644
--- a/specification/storage/Microsoft.BlobStorage/client.tsp
+++ b/specification/storage/Microsoft.BlobStorage/client.tsp
@@ -42,7 +42,7 @@ namespace Customizations;
   "expiry"
 );
 @@alternateType(BlobPropertiesInternal.contentLength, uint64, "rust");
-@@alternateType(BlobContentLengthRequired.blobContentLength, uint64, "rust");
+@@alternateType(BlobContentLengthRequired.size, uint64, "rust");
 @@alternateType(ContentLengthResponseHeader.contentLength, uint64, "rust");
 @@alternateType(ContentLengthParameter.contentLength, uint64, "rust");
 @@alternateType(StructuredContentLengthParameter.structuredContentLength,
diff --git a/specification/storage/Microsoft.BlobStorage/models.tsp b/specification/storage/Microsoft.BlobStorage/models.tsp
index 9bc4328662b4..59c85d45b95d 100644
--- a/specification/storage/Microsoft.BlobStorage/models.tsp
+++ b/specification/storage/Microsoft.BlobStorage/models.tsp
@@ -1492,7 +1492,7 @@ alias BlobContentLengthResponseHeader = {
 alias BlobContentLengthRequired = {
   /** This header specifies the maximum size for the page blob, up to 1 TB. The page blob size must be aligned to a 512-byte boundary. */
   @header("x-ms-blob-content-length")
-  blobContentLength: int64;
+  size: int64;
 };
 
 /** The deny encryption scope override response header. */