diff --git a/Makefile.am b/Makefile.am
index a217f68..780fc36 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -169,9 +169,6 @@ tock_SOURCES_hs += common/Utils.hs
 tock_SOURCES_hs += data/AST.hs
 tock_SOURCES_hs += data/CompState.hs
 tock_SOURCES_hs += data/Metadata.hs
-tock_SOURCES_hs += data/NavAST.hs
-tock_SOURCES_hs += data/OrdAST.hs
-tock_SOURCES_hs += data/TagAST.hs
 tock_SOURCES_hs += flow/FlowAlgorithms.hs
 tock_SOURCES_hs += flow/FlowGraph.hs
 tock_SOURCES_hs += flow/FlowUtils.hs