diff --git a/core/src/avm2/object.rs b/core/src/avm2/object.rs
index 844b53628..f0ca786c6 100644
--- a/core/src/avm2/object.rs
+++ b/core/src/avm2/object.rs
@@ -8,7 +8,7 @@ use crate::avm2::property::Attribute;
 use crate::avm2::return_value::ReturnValue;
 use crate::avm2::scope::Scope;
 use crate::avm2::script_object::ScriptObject;
-use crate::avm2::value::Value;
+use crate::avm2::value::{abc_default_value, Value};
 use crate::avm2::{Avm2, Error};
 use crate::context::UpdateContext;
 use enumset::EnumSet;
@@ -173,6 +173,14 @@ pub trait TObject<'gc>: 'gc + Collect + Debug + Into<Object<'gc>> + Clone + Copy
         );
 
         match &trait_entry.kind {
+            AbcTraitKind::Slot { slot_id, value, .. } => {
+                let value = if let Some(value) = value {
+                    abc_default_value(&abc, value)?
+                } else {
+                    Value::Undefined
+                };
+                self.install_slot(context.gc_context, trait_name, *slot_id, value);
+            }
             AbcTraitKind::Method { method, .. } => {
                 let method = Avm2MethodEntry::from_method_index(abc, method.clone()).unwrap();
                 let function =
diff --git a/core/src/avm2/value.rs b/core/src/avm2/value.rs
index e7bf8dc76..477ae9eaa 100644
--- a/core/src/avm2/value.rs
+++ b/core/src/avm2/value.rs
@@ -5,7 +5,7 @@ use crate::avm2::object::Object;
 use crate::avm2::Error;
 use gc_arena::Collect;
 use std::f64::NAN;
-use swf::avm2::types::{AbcFile, Index};
+use swf::avm2::types::{AbcFile, DefaultValue as AbcDefaultValue, Index};
 
 /// An AVM2 value.
 ///
@@ -210,6 +210,32 @@ pub fn abc_string_option(file: &AbcFile, index: Index<String>) -> Result<Option<
         .ok_or_else(|| format!("Unknown string constant {}", index.0).into())
 }
 
+/// Retrieve a default value as an AVM2 `Value`.
+pub fn abc_default_value<'gc>(
+    file: &AbcFile,
+    default: &AbcDefaultValue,
+) -> Result<Value<'gc>, Error> {
+    match default {
+        AbcDefaultValue::Int(i) => abc_int(file, *i).map(|v| v.into()),
+        AbcDefaultValue::Uint(u) => abc_uint(file, *u).map(|v| v.into()),
+        AbcDefaultValue::Double(d) => abc_double(file, *d).map(|v| v.into()),
+        AbcDefaultValue::String(s) => abc_string(file, s.clone()).map(|v| v.into()),
+        AbcDefaultValue::True => Ok(true.into()),
+        AbcDefaultValue::False => Ok(false.into()),
+        AbcDefaultValue::Null => Ok(Value::Null),
+        AbcDefaultValue::Undefined => Ok(Value::Undefined),
+        AbcDefaultValue::Namespace(ns)
+        | AbcDefaultValue::Package(ns)
+        | AbcDefaultValue::PackageInternal(ns)
+        | AbcDefaultValue::Protected(ns)
+        | AbcDefaultValue::Explicit(ns)
+        | AbcDefaultValue::StaticProtected(ns)
+        | AbcDefaultValue::Private(ns) => {
+            Namespace::from_abc_namespace(file, ns.clone()).map(|v| v.into())
+        }
+    }
+}
+
 impl<'gc> Value<'gc> {
     pub fn as_object(&self) -> Result<Object<'gc>, Error> {
         if let Value::Object(object) = self {