diff --git a/drmdisplaycompositor.h b/drmdisplaycompositor.h
index a1cff13..bc19f35 100644
--- a/drmdisplaycompositor.h
+++ b/drmdisplaycompositor.h
@@ -142,7 +142,7 @@
   int ApplySquash(DrmDisplayComposition *display_comp);
   int ApplyPreComposite(DrmDisplayComposition *display_comp);
   int PrepareFrame(DrmDisplayComposition *display_comp);
-  int CommitFrame(DrmDisplayComposition *display_comp);
+  int CommitFrame(DrmDisplayComposition *display_comp, bool test_only);
   int ApplyDpms(DrmDisplayComposition *display_comp);
   int DisablePlanes(DrmDisplayComposition *display_comp);