diff --git a/Plugin/StructuralSolver.cpp b/Plugin/StructuralSolver.cpp
index a064d6e7809ac9e70cf16867f160bba1af9714c3..684a9ebba45672b59221d33434c3e6f88e995974 100644
--- a/Plugin/StructuralSolver.cpp
+++ b/Plugin/StructuralSolver.cpp
@@ -4,7 +4,10 @@
 #include "Draw.h"
 #include "Utils.h"
 #include "Numeric.h"
+
+#ifdef HAVE_FLTK 
 #include "Shortcut_Window.h"
+#endif
 
 extern Mesh *THEM;
 extern Context_T CTX;