diff --git a/src/schemes/fluid/fluid.jl b/src/schemes/fluid/fluid.jl
new file mode 100644
index 000000000..22bd9415f
--- /dev/null
+++ b/src/schemes/fluid/fluid.jl
@@ -0,0 +1,2 @@
+include("viscosity.jl")
+include("weakly_compressible_sph/weakly_compressible_sph.jl")
diff --git a/src/schemes/fluid/weakly_compressible_sph/viscosity.jl b/src/schemes/fluid/viscosity.jl
similarity index 100%
rename from src/schemes/fluid/weakly_compressible_sph/viscosity.jl
rename to src/schemes/fluid/viscosity.jl
diff --git a/src/schemes/fluid/weakly_compressible_sph/weakly_compressible_sph.jl b/src/schemes/fluid/weakly_compressible_sph/weakly_compressible_sph.jl
index b4e862e95..8d3e74c27 100644
--- a/src/schemes/fluid/weakly_compressible_sph/weakly_compressible_sph.jl
+++ b/src/schemes/fluid/weakly_compressible_sph/weakly_compressible_sph.jl
@@ -1,3 +1,2 @@
 include("state_equations.jl")
-include("viscosity.jl")
 include("system.jl")
diff --git a/src/schemes/schemes.jl b/src/schemes/schemes.jl
index f199cbfd6..f502b68bb 100644
--- a/src/schemes/schemes.jl
+++ b/src/schemes/schemes.jl
@@ -1,6 +1,6 @@
 # Include all schemes without rhs first. The rhs depends on the systems to define
 # interactions between the different system types.
-include("fluid/weakly_compressible_sph/weakly_compressible_sph.jl")
+include("fluid/fluid.jl")
 include("boundary/boundary.jl")
 include("solid/total_lagrangian_sph/total_lagrangian_sph.jl")