diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -62,7 +62,6 @@
 	lemon/bin_heap.h \
 	lemon/binom_heap.h \
 	lemon/bucket_heap.h \
-	lemon/cancel_and_tighten.h \
 	lemon/capacity_scaling.h \
 	lemon/cbc.h \
 	lemon/circulation.h \