diff --git a/drmproperty.cpp b/drmproperty.cpp
index 9a28374..e276f56 100644
--- a/drmproperty.cpp
+++ b/drmproperty.cpp
@@ -95,7 +95,7 @@
   }
 }
 
-bool DrmProperty::immutable() const {
+bool DrmProperty::is_immutable() const {
   return id_ && (flags_ & DRM_MODE_PROP_IMMUTABLE);
 }