diff --git a/compositor/DrmDisplayComposition.h b/compositor/DrmDisplayComposition.h
index cbc0a90..d077aee 100644
--- a/compositor/DrmDisplayComposition.h
+++ b/compositor/DrmDisplayComposition.h
@@ -52,7 +52,7 @@
   }
 
  private:
-  DrmPlane *plane_ = NULL;
+  DrmPlane *plane_ = nullptr;
   size_t source_layer_ = kUndefinedSourceLayer;
 };
 
@@ -85,8 +85,8 @@
   }
 
  private:
-  DrmCrtc *crtc_ = NULL;
-  Planner *planner_ = NULL;
+  DrmCrtc *crtc_ = nullptr;
+  Planner *planner_ = nullptr;
 
   std::vector<DrmHwcLayer> layers_;
   std::vector<DrmCompositionPlane> composition_planes_;