diff --git a/src/Spaces.test.ts b/src/Spaces.test.ts
index c0451e17..41d80dc3 100644
--- a/src/Spaces.test.ts
+++ b/src/Spaces.test.ts
@@ -41,8 +41,7 @@ describe('Spaces', () => {
   it<SpacesTestContext>('applies the agent header to an existing SDK instance', ({ client }) => {
     const spaces = new Spaces(client);
     expect(client.options.agents).toEqual({
-      'ably-spaces': spaces.version,
-      'space-custom-client': true,
+      spaces: spaces.version,
     });
   });
 
@@ -53,8 +52,7 @@ describe('Spaces', () => {
 
     expect(ablyClient.options.agents).toEqual({
       'some-client': '1.2.3',
-      'ably-spaces': spaces.version,
-      'space-custom-client': true,
+      spaces: spaces.version,
     });
   });
 });
diff --git a/src/Spaces.ts b/src/Spaces.ts
index be2b98f0..6117aff1 100644
--- a/src/Spaces.ts
+++ b/src/Spaces.ts
@@ -50,7 +50,7 @@ class Spaces {
   }
 
   private addAgent(options: { agents?: Record<string, string | boolean> }) {
-    const agent = { 'ably-spaces': this.version, 'space-custom-client': true };
+    const agent = { spaces: this.version };
     options.agents = { ...(options.agents ?? options.agents), ...agent };
   }