diff --git a/src/rose/rose_build_anchored.h b/src/rose/rose_build_anchored.h
index 579b26d7..ef06fcbb 100644
--- a/src/rose/rose_build_anchored.h
+++ b/src/rose/rose_build_anchored.h
@@ -39,13 +39,10 @@
 #include <set>
 
 struct anchored_matcher_info;
-struct RoseEngine;
 
 namespace ue2 {
 
-class NGHolder;
 class RoseBuildImpl;
-struct Grey;
 struct raw_dfa;
 
 /**