diff --git a/core/src/avm2/globals.rs b/core/src/avm2/globals.rs
index 6d394b81c..2168af6fc 100644
--- a/core/src/avm2/globals.rs
+++ b/core/src/avm2/globals.rs
@@ -594,6 +594,12 @@ pub fn load_player_globals<'gc>(
         flash::events::fullscreenevent::create_class(mc),
         script
     );
+    class(
+        activation,
+        flash::events::eventphase::create_class(mc),
+        script,
+    )?;
+
     // package `flash.utils`
     avm2_system_class!(
         bytearray,
diff --git a/core/src/avm2/globals/flash/events.rs b/core/src/avm2/globals/flash/events.rs
index 83b3c6d2d..a3015d4be 100644
--- a/core/src/avm2/globals/flash/events.rs
+++ b/core/src/avm2/globals/flash/events.rs
@@ -3,6 +3,7 @@
 pub mod activityevent;
 pub mod event;
 pub mod eventdispatcher;
+pub mod eventphase;
 pub mod fullscreenevent;
 pub mod ieventdispatcher;
 pub mod keyboardevent;
diff --git a/core/src/avm2/globals/flash/events/eventphase.rs b/core/src/avm2/globals/flash/events/eventphase.rs
new file mode 100644
index 000000000..139650972
--- /dev/null
+++ b/core/src/avm2/globals/flash/events/eventphase.rs
@@ -0,0 +1,57 @@
+//! `flash.events.EventPhase` builtin/prototype
+
+use crate::avm2::activation::Activation;
+use crate::avm2::class::{Class, ClassAttributes};
+use crate::avm2::method::Method;
+use crate::avm2::names::{Namespace, QName};
+use crate::avm2::object::Object;
+use crate::avm2::value::Value;
+use crate::avm2::Error;
+use gc_arena::{GcCell, MutationContext};
+
+/// Implements `flash.events.EventPhase`'s instance constructor.
+pub fn instance_init<'gc>(
+    activation: &mut Activation<'_, 'gc, '_>,
+    this: Option<Object<'gc>>,
+    _args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error> {
+    if let Some(this) = this {
+        activation.super_init(this, &[])?;
+    }
+
+    Ok(Value::Undefined)
+}
+
+/// Implements `flash.events.EventPhase`'s class constructor.
+pub fn class_init<'gc>(
+    _activation: &mut Activation<'_, 'gc, '_>,
+    _this: Option<Object<'gc>>,
+    _args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error> {
+    Ok(Value::Undefined)
+}
+
+/// Construct `EventPhase`'s class.
+pub fn create_class<'gc>(mc: MutationContext<'gc, '_>) -> GcCell<'gc, Class<'gc>> {
+    let class = Class::new(
+        QName::new(Namespace::package("flash.events"), "EventPhase"),
+        Some(QName::new(Namespace::public(), "Object").into()),
+        Method::from_builtin(instance_init, "<EventPhase instance initializer>", mc),
+        Method::from_builtin(class_init, "<EventPhase class initializer>", mc),
+        mc,
+    );
+
+    let mut write = class.write(mc);
+
+    write.set_attributes(ClassAttributes::SEALED);
+    write.set_attributes(ClassAttributes::FINAL);
+
+    const CONSTANTS: &[(&str, u32)] = &[
+        ("CAPTURING_PHASE", 1),
+        ("AT_TARGET", 2),
+        ("BUBBLING_PHASE", 3),
+    ];
+    write.define_public_constant_uint_class_traits(CONSTANTS);
+
+    class
+}