diff --git a/backend/internal/service/gateway_service.go b/backend/internal/service/gateway_service.go
index cb723463..c30041bd 100644
--- a/backend/internal/service/gateway_service.go
+++ b/backend/internal/service/gateway_service.go
@@ -53,7 +53,6 @@ var allowedHeaders = map[string]bool{
 	"anthropic-beta":                            true,
 	"accept-language":                           true,
 	"sec-fetch-mode":                            true,
-	"accept-encoding":                           true,
 	"user-agent":                                true,
 	"content-type":                              true,
 }