diff --git a/virtualizationservice/aidl/android/system/virtualizationservice/VirtualMachineAppConfig.aidl b/virtualizationservice/aidl/android/system/virtualizationservice/VirtualMachineAppConfig.aidl
index a5f7c3c..9339f82 100644
--- a/virtualizationservice/aidl/android/system/virtualizationservice/VirtualMachineAppConfig.aidl
+++ b/virtualizationservice/aidl/android/system/virtualizationservice/VirtualMachineAppConfig.aidl
@@ -31,4 +31,10 @@
 
     /** Whether to run the VM in debug mode or not */
     boolean debug;
+
+    /**
+     * The amount of RAM to give the VM, in MiB. If this is 0 or negative then it will default to
+     * the value in microdroid.json, if any, or the crosvm default.
+     */
+    int memory_mib;
 }
diff --git a/virtualizationservice/src/aidl.rs b/virtualizationservice/src/aidl.rs
index 1d99c2d..19e4877 100644
--- a/virtualizationservice/src/aidl.rs
+++ b/virtualizationservice/src/aidl.rs
@@ -383,6 +383,10 @@
     let vm_config_file = File::open(vm_config_path)?;
     let mut vm_config = VmConfig::load(&vm_config_file)?.to_parcelable()?;
 
+    if config.memory_mib > 0 {
+        vm_config.memory_mib = config.memory_mib;
+    }
+
     // Microdroid requires an additional payload disk image and the bootconfig partition.
     if os_name == "microdroid" {
         let apexes = vm_payload_config.apexes.clone();
diff --git a/vm/src/run.rs b/vm/src/run.rs
index 41fdabb..1b1d5a3 100644
--- a/vm/src/run.rs
+++ b/vm/src/run.rs
@@ -62,6 +62,8 @@
         instanceImage: open_parcel_file(instance, true /* writable */)?.into(),
         configPath: config_path.to_owned(),
         debug,
+        // Use the default.
+        memory_mib: 0,
     });
     run(service, &config, &format!("{:?}!{:?}", apk, config_path), daemonize, log_path)
 }