diff --git a/packages/backend-common/src/cache/CacheClient.ts b/packages/backend-common/src/cache/CacheClient.ts
index 49b5c367dd..3b654e248b 100644
--- a/packages/backend-common/src/cache/CacheClient.ts
+++ b/packages/backend-common/src/cache/CacheClient.ts
@@ -92,7 +92,8 @@ export class DefaultCacheClient implements CacheClient {
     const wellFormedKey = Buffer.from(candidateKey).toString('base64');
 
     // Memcache in particular doesn't do well with keys > 250 bytes.
-    if (wellFormedKey.length < 250) {
+    // Padded because a plugin ID is also prepended to the key.
+    if (wellFormedKey.length < 200) {
       return wellFormedKey;
     }
 
diff --git a/packages/backend-common/src/cache/CacheManager.ts b/packages/backend-common/src/cache/CacheManager.ts
index fbd7e3ba0a..50788be56c 100644
--- a/packages/backend-common/src/cache/CacheManager.ts
+++ b/packages/backend-common/src/cache/CacheManager.ts
@@ -65,7 +65,7 @@ export class CacheManager {
   }
 
   /**
-   * Generates a CacheManagerInstance for consumption by plugins.
+   * Generates a PluginCacheManager for consumption by plugins.
    *
    * @param pluginId The plugin that the cache manager should be created for. Plugin names should be unique.
    */