symbolic toolbox: Problem with inverse laplace transform/ convolution

Hi, I have a large equation at hand that I want to perform inverse laplace transform on. Basically I tried to do this:

syms f(t) s
F= laplace(f,t,s);
ilaplace(F,s,t) %works as expected
ilaplace(diff(F,s),s,t) %also works as expected
ilaplace(F*F,s,t) % no transform executed

Backtransforing the product does however not return the convolution of the factors. Does anyone know a way to solve this or a way to work around this (for the inverse transform of a lenghty equation with lots of factors)? Thanks in advance