diff --git a/.changeset/plenty-spoons-repair.md b/.changeset/plenty-spoons-repair.md
new file mode 100644
index 00000000..2ae47445
--- /dev/null
+++ b/.changeset/plenty-spoons-repair.md
@@ -0,0 +1,6 @@
+---
+'proxy-agent': patch
+'pac-proxy-agent': patch
+---
+
+Fix `pac+` prefixed protocol URIs
diff --git a/packages/pac-proxy-agent/src/index.ts b/packages/pac-proxy-agent/src/index.ts
index 6ebdb6a9..8bf869cb 100644
--- a/packages/pac-proxy-agent/src/index.ts
+++ b/packages/pac-proxy-agent/src/index.ts
@@ -55,12 +55,12 @@ export type PacProxyAgentOptions<T> = http.AgentOptions &
  *   - "pac+https", "https" - refers to an HTTPS endpoint
  */
 export class PacProxyAgent<Uri extends string> extends Agent {
-	static readonly protocols: `pac-${Protocols}`[] = [
-		'pac-data',
-		'pac-file',
-		'pac-ftp',
-		'pac-http',
-		'pac-https',
+	static readonly protocols: `pac+${Protocols}`[] = [
+		'pac+data',
+		'pac+file',
+		'pac+ftp',
+		'pac+http',
+		'pac+https',
 	];
 
 	uri: URL;
diff --git a/packages/pac-proxy-agent/test/test.ts b/packages/pac-proxy-agent/test/test.ts
index 80e97660..6886a8c1 100644
--- a/packages/pac-proxy-agent/test/test.ts
+++ b/packages/pac-proxy-agent/test/test.ts
@@ -280,7 +280,7 @@ describe('PacProxyAgent', () => {
 				return 'HTTPS localhost:PORT;';
 			}
 
-			const uri = `data:,${encodeURIComponent(
+			const uri = `pac+data:,${encodeURIComponent(
 				FindProxyForURL.toString().replace(
 					'PORT',
 					proxyHttpsServerUrl.port
diff --git a/packages/proxy-agent/src/index.ts b/packages/proxy-agent/src/index.ts
index 0e72f2ef..98a6b22e 100644
--- a/packages/proxy-agent/src/index.ts
+++ b/packages/proxy-agent/src/index.ts
@@ -36,11 +36,11 @@ export const proxies: {
 	socks4a: [SocksProxyAgent, SocksProxyAgent],
 	socks5: [SocksProxyAgent, SocksProxyAgent],
 	socks5h: [SocksProxyAgent, SocksProxyAgent],
-	'pac-data': [PacProxyAgent, PacProxyAgent],
-	'pac-file': [PacProxyAgent, PacProxyAgent],
-	'pac-ftp': [PacProxyAgent, PacProxyAgent],
-	'pac-http': [PacProxyAgent, PacProxyAgent],
-	'pac-https': [PacProxyAgent, PacProxyAgent],
+	'pac+data': [PacProxyAgent, PacProxyAgent],
+	'pac+file': [PacProxyAgent, PacProxyAgent],
+	'pac+ftp': [PacProxyAgent, PacProxyAgent],
+	'pac+http': [PacProxyAgent, PacProxyAgent],
+	'pac+https': [PacProxyAgent, PacProxyAgent],
 };
 
 function isValidProtocol(v: string): v is ValidProtocol {