diff --git a/lib/bindings/http/unmarshaller.js b/lib/bindings/http/unmarshaller.js
index 99688c39..d52164a7 100644
--- a/lib/bindings/http/unmarshaller.js
+++ b/lib/bindings/http/unmarshaller.js
@@ -22,23 +22,23 @@ function resolveBindingName(payload, headers) {
     // Structured
     if (allowedStructuredContentTypes.includes(contentType)) {
       return STRUCTURED;
-    } else {
-      const err = new TypeError("structured+type not allowed");
-      err.errors = [contentType];
-      throw err;
     }
+    throwTypeError("structured+type not allowed", contentType);
   } else {
     // Binary
     if (allowedBinaryContentTypes.includes(contentType)) {
       return BINARY;
-    } else {
-      const err = new TypeError("content type not allowed");
-      err.errors = [contentType];
-      throw err;
     }
+    throwTypeError("content type not allowed", contentType);
   }
 }
 
+function throwTypeError(msg, contentType) {
+  const err = new TypeError(msg);
+  err.errors = [contentType];
+  throw err;
+}
+
 class Unmarshaller {
   constructor(receiverByBinding) {
     this.receiverByBinding = receiverByBinding;