diff --git a/src/macros.jl b/src/macros.jl
index 7f3c3a2d..6978fa00 100644
--- a/src/macros.jl
+++ b/src/macros.jl
@@ -883,8 +883,13 @@ ConstrainedBlackBoxControlDiscreteSystem{typeof(f),BallInf{Float64,Array{Float64
 macro system(expr...)
     try
         dyn_eq, AT, constr, state, input, noise, dim, x0 = _parse_system(expr)
-        sys_type, var_names = _get_system_type(dyn_eq, AT, constr, state, input, noise, dim)
-        sys = Expr(:call, :($sys_type), :($(var_names...)))
+        if @capture(expr[1], (M_*x_'' + C_*x_' + K_*x_ = 0))
+            variableNames = :(M, C, K)
+            sys = Expr(:call, SecondOrderLinearContinuousSystem, :($variableNames...))
+        else
+            sys_type, var_names = _get_system_type(dyn_eq, AT, constr, state, input, noise, dim)
+            sys = Expr(:call, :($sys_type), :($(var_names...)))
+        end
         if x0 == nothing
             return esc(sys)
         else
@@ -900,6 +905,8 @@ macro system(expr...)
     end
 end
 
+
+
 """
     ivp(expr...)