diff --git a/libsrc/visualization/fieldlines.hpp b/libsrc/visualization/fieldlines.hpp
index d4dfacdf..ac3d9fae 100644
--- a/libsrc/visualization/fieldlines.hpp
+++ b/libsrc/visualization/fieldlines.hpp
@@ -1,5 +1,5 @@
-#ifndef VSFIELDLINES_HPP_INCLUDED
-#define VSFIELDLINES_HPP_INCLUDED
+#ifndef FIELDLINES_HPP_INCLUDED
+#define FIELDLINES_HPP_INCLUDED
 
 namespace netgen
 {
diff --git a/libsrc/visualization/vssolution.hpp b/libsrc/visualization/vssolution.hpp
index 36c52467..c1d9629b 100644
--- a/libsrc/visualization/vssolution.hpp
+++ b/libsrc/visualization/vssolution.hpp
@@ -1,7 +1,7 @@
 #ifndef FILE_VSSOLUTION
 #define FILE_VSSOLUTION
 
-#include "vsfieldlines.hpp"
+#include "fieldlines.hpp"
 
 typedef void * ClientData;
 struct Tcl_Interp;