Created attachment 304 [details] model triggering the problem Suppose we have a template: Template(int i){...}; Then in the system declaration: const int A[2] = {1,1}; Process = Template(A[0]); system Process; Uppaal complains at the A[0] expression: [error] syntax error, unexpected ']'. If the array variable is renamed to anything but A, then the symptoms are gone. I tried with variable name E, but Uppaal is fine with that. 4.1.19 does not have this issue.