diff --git a/proto/v3/message_contents/association.proto b/proto/v3/message_contents/association.proto
index 681c510c..547f39f7 100644
--- a/proto/v3/message_contents/association.proto
+++ b/proto/v3/message_contents/association.proto
@@ -17,7 +17,7 @@ enum AssociationTextVersion {
 message Eip191Association {
   AssociationTextVersion association_text_version = 1;
   RecoverableEcdsaSignature signature = 2;
-  string wallet_address = 3;
+  bytes wallet_address = 3;
 }
 
 // RecoverableEcdsaSignature