diff --git a/packages/amino/src/pubkeys.spec.ts b/packages/amino/src/pubkeys.spec.ts
index ec47bdcb3d..ad11937c45 100644
--- a/packages/amino/src/pubkeys.spec.ts
+++ b/packages/amino/src/pubkeys.spec.ts
@@ -1,4 +1,4 @@
-import { isMultisigThresholdPubkey, isSinglePubkey } from "./pubkeys";
+import { isEd25519Pubkey, isMultisigThresholdPubkey, isSecp256k1Pubkey, isSinglePubkey } from "./pubkeys";
 
 describe("pubkeys", () => {
   const pubkeyEd25519 = {
@@ -49,4 +49,20 @@ describe("pubkeys", () => {
       expect(isMultisigThresholdPubkey(pubkeyMultisigThreshold)).toEqual(true);
     });
   });
+
+  describe("isEd25519Pubkey", () => {
+    it("works", () => {
+      expect(isEd25519Pubkey(pubkeyEd25519)).toEqual(true);
+      expect(isEd25519Pubkey(pubkeySecp256k1)).toEqual(false);
+      expect(isEd25519Pubkey(pubkeyMultisigThreshold)).toEqual(false);
+    });
+  });
+
+  describe("isSecp256k1Pubkey", () => {
+    it("works", () => {
+      expect(isSecp256k1Pubkey(pubkeyEd25519)).toEqual(false);
+      expect(isSecp256k1Pubkey(pubkeySecp256k1)).toEqual(true);
+      expect(isSecp256k1Pubkey(pubkeyMultisigThreshold)).toEqual(false);
+    });
+  });
 });
diff --git a/packages/amino/src/pubkeys.ts b/packages/amino/src/pubkeys.ts
index d61bfa3c39..1ddf97ce47 100644
--- a/packages/amino/src/pubkeys.ts
+++ b/packages/amino/src/pubkeys.ts
@@ -12,7 +12,7 @@ export interface Ed25519Pubkey extends SinglePubkey {
 }
 
 export function isEd25519Pubkey(pubkey: Pubkey): pubkey is Ed25519Pubkey {
-  return (pubkey as Ed25519Pubkey).type === "tendermint/PubKeyEd25519";
+  return pubkey.type === "tendermint/PubKeyEd25519";
 }
 
 export interface Secp256k1Pubkey extends SinglePubkey {
@@ -21,7 +21,7 @@ export interface Secp256k1Pubkey extends SinglePubkey {
 }
 
 export function isSecp256k1Pubkey(pubkey: Pubkey): pubkey is Secp256k1Pubkey {
-  return (pubkey as Secp256k1Pubkey).type === "tendermint/PubKeySecp256k1";
+  return pubkey.type === "tendermint/PubKeySecp256k1";
 }
 
 export const pubkeyType = {
@@ -67,5 +67,5 @@ export interface MultisigThresholdPubkey extends Pubkey {
 }
 
 export function isMultisigThresholdPubkey(pubkey: Pubkey): pubkey is MultisigThresholdPubkey {
-  return (pubkey as MultisigThresholdPubkey).type === "tendermint/PubKeyMultisigThreshold";
+  return pubkey.type === "tendermint/PubKeyMultisigThreshold";
 }