diff --git a/lib/http.js b/lib/http.js
index 0ffefd581bd..efa0963be33 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -540,10 +540,6 @@ OutgoingMessage.prototype.getHeader = function(name) {
     throw new Error("`name` is required for getHeader().");
   }
 
-  if (this._header) {
-    throw new Error("Can't use mutable header APIs after sent.");
-  }
-
   if (!this._headers) return;
 
   var key = name.toLowerCase();
diff --git a/lib/http2.js b/lib/http2.js
index 716a7810b33..ebfd3c7a267 100644
--- a/lib/http2.js
+++ b/lib/http2.js
@@ -540,10 +540,6 @@ OutgoingMessage.prototype.getHeader = function(name) {
     throw new Error("`name` is required for getHeader().");
   }
 
-  if (this._header) {
-    throw new Error("Can't use mutable header APIs after sent.");
-  }
-
   if (!this._headers) return;
 
   var key = name.toLowerCase();