diff --git a/lib/wallet.js b/lib/wallet.js
index d54a4f63..de24fca5 100644
--- a/lib/wallet.js
+++ b/lib/wallet.js
@@ -17,6 +17,6 @@ export function generateTypeDefName (walletField) {
 
 export function walletTypeToResolveType (walletType) {
   // wallet type is in UPPER_CASE but __resolveType requires PascalCase
-  const PascalCase = walletType.split('_').map(s => s[0].toUpperCase() + s.slice(1)).join()
+  const PascalCase = walletType.split('_').map(s => s[0].toUpperCase() + s.slice(1).toLowerCase()).join('')
   return `Wallet${PascalCase}`
 }