diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -84,6 +84,7 @@
 	lemon/error.h \
 	lemon/euler.h \
 	lemon/fib_heap.h \
+	lemon/fractional_matching.h \
 	lemon/full_graph.h \
 	lemon/glpk.h \
 	lemon/gomory_hu.h \