diff --git a/lib/bindings/http/unmarshaller.js b/lib/bindings/http/unmarshaller.js
index d52164a..db79a8d 100644
--- a/lib/bindings/http/unmarshaller.js
+++ b/lib/bindings/http/unmarshaller.js
@@ -1,24 +1,30 @@
-const Constants = require("./constants.js");
+const {
+  HEADER_CONTENT_TYPE,
+  MIME_CE,
+  MIME_CE_JSON,
+  MIME_JSON,
+  MIME_OCTET_STREAM
+} = require("./constants.js");
 const Commons = require("./commons.js");
 
 const STRUCTURED = "structured";
 const BINARY = "binary";
 
 const allowedBinaryContentTypes = [
-  Constants.MIME_JSON,
-  Constants.MIME_OCTET_STREAM
+  MIME_JSON,
+  MIME_OCTET_STREAM
 ];
 
 const allowedStructuredContentTypes = [
-  Constants.MIME_CE_JSON
+  MIME_CE_JSON
 ];
 
 // Is it binary or structured?
 function resolveBindingName(payload, headers) {
   const contentType =
-    Commons.sanityContentType(headers[Constants.HEADER_CONTENT_TYPE]);
+    Commons.sanityContentType(headers[HEADER_CONTENT_TYPE]);
 
-  if (contentType.startsWith(Constants.MIME_CE)) {
+  if (contentType.startsWith(MIME_CE)) {
     // Structured
     if (allowedStructuredContentTypes.includes(contentType)) {
       return STRUCTURED;
@@ -54,7 +60,7 @@ class Unmarshaller {
 
     // Validation level 1
     const sanityHeaders = Commons.sanityAndClone(headers);
-    if (!sanityHeaders[Constants.HEADER_CONTENT_TYPE]) {
+    if (!sanityHeaders[HEADER_CONTENT_TYPE]) {
       throw new TypeError("content-type header not found");
     }