diff --git a/packages/backend-defaults/src/entrypoints/cache/CacheManager.test.ts b/packages/backend-defaults/src/entrypoints/cache/CacheManager.test.ts
index 82e4b03d56..fc7ed34fc4 100644
--- a/packages/backend-defaults/src/entrypoints/cache/CacheManager.test.ts
+++ b/packages/backend-defaults/src/entrypoints/cache/CacheManager.test.ts
@@ -264,4 +264,57 @@ describe('CacheManager store options', () => {
       defaults: undefined,
     });
   });
+
+  it('respects client config for non-clustered mode', () => {
+    const manager = CacheManager.fromConfig(
+      mockServices.rootConfig({
+        data: {
+          backend: {
+            cache: {
+              store: 'redis',
+              connection: 'redis://localhost:6379',
+              redis: {
+                client: {
+                  keyPrefixSeparator: '!',
+                },
+              },
+            },
+          },
+        },
+      }),
+    );
+    manager.forPlugin('p1');
+
+    expect(KeyvRedis).toHaveBeenCalledWith('redis://localhost:6379', {
+      keyPrefixSeparator: '!',
+    });
+  });
+
+  it('accepts client config for clustered mode', () => {
+    const manager = CacheManager.fromConfig(
+      mockServices.rootConfig({
+        data: {
+          backend: {
+            cache: {
+              store: 'redis',
+              connection: 'redis://localhost:6379',
+              redis: {
+                client: {
+                  keyPrefixSeparator: '!',
+                },
+                cluster: {
+                  rootNodes: [{ url: 'redis://localhost:6379' }],
+                },
+              },
+            },
+          },
+        },
+      }),
+    );
+    manager.forPlugin('p1');
+
+    expect(KeyvRedis).toHaveBeenCalledWith(expect.anything(), {
+      keyPrefixSeparator: '!',
+    });
+  });
 });
diff --git a/packages/backend-defaults/src/entrypoints/cache/CacheManager.ts b/packages/backend-defaults/src/entrypoints/cache/CacheManager.ts
index 8c0afae826..e4f0f5f408 100644
--- a/packages/backend-defaults/src/entrypoints/cache/CacheManager.ts
+++ b/packages/backend-defaults/src/entrypoints/cache/CacheManager.ts
@@ -211,15 +211,15 @@ export class CacheManager {
 
     return (pluginId, defaultTtl) => {
       if (!stores[pluginId]) {
+        const redisOptions = this.storeOptions?.client || {
+          keyPrefixSeparator: ':',
+        };
         if (this.storeOptions?.cluster) {
           // Create a Redis cluster
           const cluster = createCluster(this.storeOptions?.cluster);
-          stores[pluginId] = new KeyvRedis(cluster);
+          stores[pluginId] = new KeyvRedis(cluster, redisOptions);
         } else {
           // Create a regular Redis connection
-          const redisOptions = this.storeOptions?.client || {
-            keyPrefixSeparator: ':',
-          };
           stores[pluginId] = new KeyvRedis(this.connection, redisOptions);
         }