diff --git a/lib/encoder.js b/lib/encoder.js
index 74219f77..25fd5d30 100644
--- a/lib/encoder.js
+++ b/lib/encoder.js
@@ -1330,6 +1330,7 @@ function defineInstanceMembers() {
         frozen: false
       }
     };
+    typeName = typeName.trim();
     startIndex = startIndex || 0;
     let params;
     if (!length) {