diff --git a/lemon/lgf_reader.h b/lemon/lgf_reader.h
--- a/lemon/lgf_reader.h
+++ b/lemon/lgf_reader.h
@@ -32,7 +32,7 @@
 #include <map>
 
 #include <lemon/assert.h>
-#include <lemon/graph_utils.h>
+#include <lemon/core.h>
 
 #include <lemon/lgf_writer.h>