diff --git a/core/src/avm2/activation.rs b/core/src/avm2/activation.rs
index 3b609298c..25c5d35ce 100644
--- a/core/src/avm2/activation.rs
+++ b/core/src/avm2/activation.rs
@@ -705,6 +705,7 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
                 Op::Li16 => self.op_li16(),
                 Op::Li32 => self.op_li32(),
                 Op::Lf32 => self.op_lf32(),
+                Op::Lf64 => self.op_lf64(),
                 _ => self.unknown_op(op),
             };
 
@@ -2677,6 +2678,28 @@ impl<'a, 'gc, 'gc_context> Activation<'a, 'gc, 'gc_context> {
         Ok(FrameControl::Continue)
     }
 
+    /// Implements `Op::Lf64`
+    fn op_lf64(&mut self) -> Result<FrameControl<'gc>, Error> {
+        let address = self.context.avm2.pop().coerce_to_u32(self)? as usize;
+
+        let dm = self.domain_memory().expect("Not domain memory?");
+        let r = dm.read();
+        let val = r.get_range(address..address + 8);
+        drop(dm);
+
+        if let Some(val) = val {
+            let buf: [u8; 8] = [val[0], val[1], val[2], val[3], val[4], val[5], val[6], val[7]];
+
+            self.context
+                .avm2
+                .push(Value::Number(f64::from_le_bytes(buf)));
+        } else {
+            return Err("RangeError: The specified range is invalid".into());
+        }
+
+        Ok(FrameControl::Continue)
+    }
+
     #[allow(unused_variables)]
     #[cfg(avm_debug)]
     fn op_debug(