diff --git a/src/Spaces.test.ts b/src/Spaces.test.ts
index 79941d1a..41d80dc3 100644
--- a/src/Spaces.test.ts
+++ b/src/Spaces.test.ts
@@ -42,7 +42,6 @@ describe('Spaces', () => {
     const spaces = new Spaces(client);
     expect(client.options.agents).toEqual({
       spaces: spaces.version,
-      'space-custom-client': true,
     });
   });
 
@@ -54,7 +53,6 @@ describe('Spaces', () => {
     expect(ablyClient.options.agents).toEqual({
       'some-client': '1.2.3',
       spaces: spaces.version,
-      'space-custom-client': true,
     });
   });
 });
diff --git a/src/Spaces.ts b/src/Spaces.ts
index 9a5fa006..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 = { spaces: this.version, 'space-custom-client': true };
+    const agent = { spaces: this.version };
     options.agents = { ...(options.agents ?? options.agents), ...agent };
   }