real_T datatype undefined in simulink generated code

I have a stateflow chart in my simulink model where I'm doing some calculations with some f32 variables. The code generated by matlab uses some variable called real_T which I understand is supposed to be a double but then when I compile it I get an error saying that 'real_T is undefined'.

How could I solve this issue? I have not yet found a solution. Please give me some tips if possible. Thanks!