diff --git a/src/Makefile.am b/src/Makefile.am
index e27586d1ac..9398d488e9 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -263,10 +263,12 @@ BITCOIN_CORE_H = \
   spats/base_asset.hpp \
   spats/identification.hpp \
   spats/manager.hpp \
+  spats/modification.hpp \
   spats/registry.hpp \
   spats/spark_asset.hpp \
   spats/wallet.hpp \
   utils/constrained_value.hpp \
+  utils/empty_class.hpp \
   utils/enum.hpp \
   utils/lock_proof.hpp \
   utils/math.hpp \
diff --git a/src/spats/registry.hpp b/src/spats/registry.hpp
index 58d47fe9ac..d18beb7ad7 100644
--- a/src/spats/registry.hpp
+++ b/src/spats/registry.hpp
@@ -13,7 +13,6 @@
 #include <deque>
 
 #include "../uint256.h"
-#include "../utils/empty_class.hpp"
 #include "../utils/lock_proof.hpp"
 
 #include "spark_asset.hpp"