diff --git a/Makefile.am b/Makefile.am
index 35ae5c0..dbb76a0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -145,6 +145,7 @@ tock_SOURCES_hs += frontends/RainPasses.hs
 tock_SOURCES_hs += frontends/RainTypes.hs
 tock_SOURCES_hs += frontends/StructureOccam.hs
 tock_SOURCES_hs += frontends/TypeUnification.hs
+tock_SOURCES_hs += frontends/UnifyType.hs
 tock_SOURCES_hs += pass/Pass.hs
 tock_SOURCES_hs += pass/PassList.hs
 tock_SOURCES_hs += pass/Properties.hs