diff --git a/src/acpi/aml/namedobj.rs b/src/acpi/aml/namedobj.rs
index 8589d6f..4fdd8f6 100644
--- a/src/acpi/aml/namedobj.rs
+++ b/src/acpi/aml/namedobj.rs
@@ -205,6 +205,10 @@ impl AmlExecutable for NamedObj {
                     obj_list: local_namespace
                 });
             },
+            NamedObj::DefMutex { ref name, sync_level } => {
+                let local_scope_string = get_namespace_string(scope, name.clone());
+                namespace.insert(local_scope_string, AmlValue::Mutex(sync_level));
+            },
             _ => ()
         }
 
diff --git a/src/acpi/aml/namespace.rs b/src/acpi/aml/namespace.rs
index 5d725da..ab49846 100644
--- a/src/acpi/aml/namespace.rs
+++ b/src/acpi/aml/namespace.rs
@@ -27,7 +27,7 @@ pub enum AmlValue {
     Integer,
     IntegerConstant(u64),
     Method(Method),
-    Mutex,
+    Mutex(u8),
     ObjectReference(SuperName),
     OperationRegion {
         region: RegionSpace,