diff --git a/drmproperty.cpp b/drmproperty.cpp
index dcab05e..9faa37e 100644
--- a/drmproperty.cpp
+++ b/drmproperty.cpp
@@ -100,6 +100,10 @@
   }
 }
 
+bool DrmProperty::immutable() const {
+  return id_ && (flags_ & DRM_MODE_PROP_IMMUTABLE);
+}
+
 std::tuple<uint64_t, int> DrmProperty::GetEnumValueWithName(
     std::string name) const {
   for (auto it : enums_) {