diff --git a/gpu.cmake b/gpu.cmake
index e7a2630247672c3115b8b8d7206b707756506ba7..8d19d93f1e02c0f121afc7aed43c6e705dac9adf 100644
--- a/gpu.cmake
+++ b/gpu.cmake
@@ -45,7 +45,7 @@ IF (BUILD_VF_GPU)
     #add_subdirectory(apps/gpu/LBM/TGV_3D)
     #add_subdirectory(apps/gpu/LBM/TGV_3D_MultiGPU)
 	# add_subdirectory(apps/gpu/LBM/SphereScaling)
-	# add_subdirectory(apps/gpu/LBM/MusselOyster)
+	add_subdirectory(apps/gpu/LBM/MusselOyster)
     add_subdirectory(apps/gpu/LBM/DrivenCavityMultiGPU)
 ELSE()
     MESSAGE( STATUS "exclude Virtual Fluids GPU." )