diff --git a/packages/client/lib/commands/MEMORY_USAGE.spec.ts b/packages/client/lib/commands/MEMORY_USAGE.spec.ts
index edf673564ee..9f14f37a704 100644
--- a/packages/client/lib/commands/MEMORY_USAGE.spec.ts
+++ b/packages/client/lib/commands/MEMORY_USAGE.spec.ts
@@ -20,6 +20,15 @@ describe('MEMORY USAGE', () => {
         ['MEMORY', 'USAGE', 'key', 'SAMPLES', '1']
       );
     });
+
+    it('with SAMPLES 0 (sample all nested values)', () => {
+      assert.deepEqual(
+        parseArgs(MEMORY_USAGE, 'key', {
+          SAMPLES: 0
+        }),
+        ['MEMORY', 'USAGE', 'key', 'SAMPLES', '0']
+      );
+    });
   });
 
   testUtils.testWithClient('client.memoryUsage', async client => {
diff --git a/packages/client/lib/commands/MEMORY_USAGE.ts b/packages/client/lib/commands/MEMORY_USAGE.ts
index 6e85438dbed..ff5336d32e5 100644
--- a/packages/client/lib/commands/MEMORY_USAGE.ts
+++ b/packages/client/lib/commands/MEMORY_USAGE.ts
@@ -2,6 +2,10 @@ import { CommandParser } from '../client/parser';
 import { NumberReply, NullReply, Command, RedisArgument } from '../RESP/types';
 
 export interface MemoryUsageOptions {
+  /**
+   * Number of sampled nested values for aggregate types. `0` samples all of
+   * them; the default is 5.
+   */
   SAMPLES?: number;
 }
 
@@ -11,7 +15,7 @@ export default {
     parser.push('MEMORY', 'USAGE');
     parser.pushKey(key);
 
-    if (options?.SAMPLES) {
+    if (options?.SAMPLES !== undefined) {
       parser.push('SAMPLES', options.SAMPLES.toString());
     }
   },