diff --git a/src/errors/masto-deserialize-error.ts b/src/errors/masto-deserialize-error.ts
index ca366c589..af11b7d36 100644
--- a/src/errors/masto-deserialize-error.ts
+++ b/src/errors/masto-deserialize-error.ts
@@ -14,5 +14,6 @@ export class MastoDeserializeError extends MastoError {
     props?: MastoErrorProps,
   ) {
     super(message, props);
+    Object.setPrototypeOf(this, MastoDeserializeError.prototype);
   }
 }
diff --git a/src/errors/masto-error.ts b/src/errors/masto-error.ts
index d12c06f1f..861e31020 100644
--- a/src/errors/masto-error.ts
+++ b/src/errors/masto-error.ts
@@ -43,6 +43,8 @@ export abstract class MastoError extends Error {
    */
   constructor(message: string, props: MastoErrorProps = {}) {
     super(message, { cause: props.cause });
+    Object.setPrototypeOf(this, MastoError.prototype);
+
     this.description = props.description;
     this.details = props.details;
   }
diff --git a/src/errors/masto-http-conflict-error.ts b/src/errors/masto-http-conflict-error.ts
index eb8829f5d..19017e727 100644
--- a/src/errors/masto-http-conflict-error.ts
+++ b/src/errors/masto-http-conflict-error.ts
@@ -9,5 +9,6 @@ export class MastoHttpConflictError extends MastoHttpError {
 
   constructor(message: string, props?: MastoErrorProps) {
     super(message, 409, props);
+    Object.setPrototypeOf(this, MastoHttpConflictError.prototype);
   }
 }
diff --git a/src/errors/masto-http-error.ts b/src/errors/masto-http-error.ts
index 92e98e591..99103b09f 100644
--- a/src/errors/masto-http-error.ts
+++ b/src/errors/masto-http-error.ts
@@ -7,6 +7,7 @@ export abstract class MastoHttpError extends MastoError {
 
   constructor(message: string, statusCode: number, props?: MastoErrorProps) {
     super(message, props);
+    Object.setPrototypeOf(this, MastoHttpError.prototype);
     this.statusCode = statusCode;
   }
 }
diff --git a/src/errors/masto-http-forbidden-error.ts b/src/errors/masto-http-forbidden-error.ts
index 03b7b7d37..d1994d3f0 100644
--- a/src/errors/masto-http-forbidden-error.ts
+++ b/src/errors/masto-http-forbidden-error.ts
@@ -9,5 +9,6 @@ export class MastoHttpForbiddenError extends MastoHttpError {
 
   constructor(message: string, props?: MastoErrorProps) {
     super(message, 403, props);
+    Object.setPrototypeOf(this, MastoHttpForbiddenError.prototype);
   }
 }
diff --git a/src/errors/masto-http-gone-error.ts b/src/errors/masto-http-gone-error.ts
index a2380f6e3..bad7ad324 100644
--- a/src/errors/masto-http-gone-error.ts
+++ b/src/errors/masto-http-gone-error.ts
@@ -9,5 +9,6 @@ export class MastoHttpGoneError extends MastoHttpError {
 
   constructor(message: string, props?: MastoErrorProps) {
     super(message, 410, props);
+    Object.setPrototypeOf(this, MastoHttpGoneError.prototype);
   }
 }
diff --git a/src/errors/masto-http-not-found-error.ts b/src/errors/masto-http-not-found-error.ts
index 55a8c5bf1..ff3467111 100644
--- a/src/errors/masto-http-not-found-error.ts
+++ b/src/errors/masto-http-not-found-error.ts
@@ -5,9 +5,10 @@ import { MastoHttpError } from './masto-http-error';
  * Mastodon not found error class
  */
 export class MastoHttpNotFoundError extends MastoHttpError {
-  override name = 'MastoNotFoundError';
+  override name = 'MastoHttpNotFoundError';
 
   constructor(message: string, props?: MastoErrorProps) {
     super(message, 404, props);
+    Object.setPrototypeOf(this, MastoHttpNotFoundError.prototype);
   }
 }
diff --git a/src/errors/masto-http-rate-limit-error.ts b/src/errors/masto-http-rate-limit-error.ts
index 8836c0977..398581a00 100644
--- a/src/errors/masto-http-rate-limit-error.ts
+++ b/src/errors/masto-http-rate-limit-error.ts
@@ -11,7 +11,7 @@ export type MastoRateLimitErrorProps = MastoErrorProps & {
  * Mastodon rate limit error class
  */
 export class MastoHttpRateLimitError extends MastoHttpError {
-  override name = 'MastoRateLimitError';
+  override name = 'MastoHttpRateLimitError';
 
   /** Number of requests permitted per time period */
   readonly limit: number;
@@ -22,6 +22,8 @@ export class MastoHttpRateLimitError extends MastoHttpError {
 
   constructor(message: string, props: MastoRateLimitErrorProps) {
     super(message, 429, props);
+    Object.setPrototypeOf(this, MastoHttpRateLimitError.prototype);
+
     this.limit = props?.limit;
     this.remaining = props?.remaining;
     this.reset = props?.reset;
diff --git a/src/errors/masto-http-unauthorized-error.ts b/src/errors/masto-http-unauthorized-error.ts
index 45db9f1ae..796fbbaf6 100644
--- a/src/errors/masto-http-unauthorized-error.ts
+++ b/src/errors/masto-http-unauthorized-error.ts
@@ -5,9 +5,10 @@ import { MastoHttpError } from './masto-http-error';
  * Mastodon unauthorized error class
  */
 export class MastoHttpUnauthorizedError extends MastoHttpError {
-  override name = 'MastoUnauthorizedError';
+  override name = 'MastoHttpUnauthorizedError';
 
   constructor(message: string, props: MastoErrorProps) {
     super(message, 401, props);
+    Object.setPrototypeOf(this, MastoHttpUnauthorizedError.prototype);
   }
 }
diff --git a/src/errors/masto-http-unexpected-error.ts b/src/errors/masto-http-unexpected-error.ts
index 2e06e1058..7d0b53e85 100644
--- a/src/errors/masto-http-unexpected-error.ts
+++ b/src/errors/masto-http-unexpected-error.ts
@@ -6,5 +6,6 @@ export class MastoHttpUnexpectedError extends MastoHttpError {
 
   constructor(message: string, statusCode: number, props?: MastoErrorProps) {
     super(message, statusCode, props);
+    Object.setPrototypeOf(this, MastoHttpUnexpectedError.prototype);
   }
 }
diff --git a/src/errors/masto-http-unprocessable-entity-error.ts b/src/errors/masto-http-unprocessable-entity-error.ts
index 2604dcd4c..f9c22a37b 100644
--- a/src/errors/masto-http-unprocessable-entity-error.ts
+++ b/src/errors/masto-http-unprocessable-entity-error.ts
@@ -9,5 +9,6 @@ export class MastoHttpUnprocessableEntityError extends MastoHttpError {
 
   constructor(message: string, props: MastoErrorProps) {
     super(message, 422, props);
+    Object.setPrototypeOf(this, MastoHttpUnprocessableEntityError.prototype);
   }
 }
diff --git a/src/errors/masto-timeout-error.ts b/src/errors/masto-timeout-error.ts
index 763f79f7d..448271d76 100644
--- a/src/errors/masto-timeout-error.ts
+++ b/src/errors/masto-timeout-error.ts
@@ -9,5 +9,6 @@ export class MastoTimeoutError extends MastoError {
 
   constructor(message: string, props?: MastoErrorProps) {
     super(message, props);
+    Object.setPrototypeOf(this, MastoTimeoutError.prototype);
   }
 }
diff --git a/src/errors/masto-unexpected-error.ts b/src/errors/masto-unexpected-error.ts
index 22f94f2c7..2f5850ff2 100644
--- a/src/errors/masto-unexpected-error.ts
+++ b/src/errors/masto-unexpected-error.ts
@@ -6,5 +6,6 @@ export class MastoUnexpectedError extends MastoError {
 
   constructor(message: string, props: MastoErrorProps = {}) {
     super(message, { cause: props.cause });
+    Object.setPrototypeOf(this, MastoUnexpectedError.prototype);
   }
 }
diff --git a/src/errors/masto-version-error.ts b/src/errors/masto-version-error.ts
index 31b19b755..3370314ea 100644
--- a/src/errors/masto-version-error.ts
+++ b/src/errors/masto-version-error.ts
@@ -9,5 +9,6 @@ export class MastoVersionError extends MastoError {
 
   constructor(message: string, props?: MastoErrorProps) {
     super(message, props);
+    Object.setPrototypeOf(this, MastoVersionError.prototype);
   }
 }