diff --git a/service/internal/checksum/middleware_compute_input_checksum.go b/service/internal/checksum/middleware_compute_input_checksum.go
index b40181cbc26..5d730a0b0b2 100644
--- a/service/internal/checksum/middleware_compute_input_checksum.go
+++ b/service/internal/checksum/middleware_compute_input_checksum.go
@@ -16,7 +16,6 @@ import (
 )
 
 const (
-	contentMD5Header                           = "Content-Md5"
 	streamingUnsignedPayloadTrailerPayloadHash = "STREAMING-UNSIGNED-PAYLOAD-TRAILER"
 )