diff --git a/gcc/testsuite/gfortran.dg/submodule_3.f90 b/gcc/testsuite/gfortran.dg/submodule_3.f08
similarity index 100%
rename from gcc/testsuite/gfortran.dg/submodule_3.f90
rename to gcc/testsuite/gfortran.dg/submodule_3.f08