--- /dev/null
+! { dg-do compile }
+!
+! PR fortran/53732
+! this was leading to an internal "mismatching comparison operand types"
+! error.
+!
+! Original testcase by minzastro <minzastro@googlemail.com>
+! Fixed by Dominique Dhumieres <dominiq@lps.ens.fr>
+
+program test
+implicit none
+
+real(8) arr(4,4,4,4)
+
+arr(:,:,:,:) = 1d0
+
+arr(1,:,:,:) = sum(arr, dim=1, mask=(arr(:,:,:,:) > 0d0))
+
+end program test