diff --git a/src/Makefile.am b/src/Makefile.am
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -312,6 +312,8 @@
   script/script_error.h \
   serialize.h \
   tinyformat.h \
+  uint256.cpp \
+  uint256.h \
   utilstrencodings.cpp \
   utilstrencodings.h \
   version.h