diff --git a/src/FDM/YASim/Rotor.cpp b/src/FDM/YASim/Rotor.cpp
index e8cf810dd..b9788174f 100644
--- a/src/FDM/YASim/Rotor.cpp
+++ b/src/FDM/YASim/Rotor.cpp
@@ -7,7 +7,7 @@
 
 #include "Math.hpp"
 #include <Main/fg_props.hxx>
-#include "Surface.hpp"
+//#include "Surface.hpp"
 #include "Rotorpart.hpp"
 #include "Glue.hpp"
 #include "Ground.hpp"
diff --git a/src/FDM/YASim/Rotor.hpp b/src/FDM/YASim/Rotor.hpp
index d3e70ec1e..7abd764ea 100644
--- a/src/FDM/YASim/Rotor.hpp
+++ b/src/FDM/YASim/Rotor.hpp
@@ -9,7 +9,7 @@
 
 namespace yasim {
 
-class Surface;
+//class Surface;
 class Rotorpart;
 class Ground;
 const float rho_null=1.184f; //25DegC, 101325Pa