diff --git a/src/gpu/VirtualFluids_GPU/GPU/GPU_Interface.h b/src/gpu/VirtualFluids_GPU/GPU/GPU_Interface.h
index 3d232dcb8d2c1259eca51d5279b32b346e21470c..3f517369c8d1304579500453396b131d91b12e00 100644
--- a/src/gpu/VirtualFluids_GPU/GPU/GPU_Interface.h
+++ b/src/gpu/VirtualFluids_GPU/GPU/GPU_Interface.h
@@ -15,7 +15,7 @@
 #include <DataTypes.h>
 #include "LBM/LB.h"
 
-class LBMSimulationParameter;
+struct LBMSimulationParameter;
 
 //////////////////////////////////////////////////////////////////////////
 //Kernel