diff --git a/krylov/psb_ccg.f90 b/krylov/psb_ccg.F90
similarity index 100%
rename from krylov/psb_ccg.f90
rename to krylov/psb_ccg.F90
diff --git a/krylov/psb_dcg.f90 b/krylov/psb_dcg.F90
similarity index 100%
rename from krylov/psb_dcg.f90
rename to krylov/psb_dcg.F90
diff --git a/krylov/psb_scg.f90 b/krylov/psb_scg.F90
similarity index 100%
rename from krylov/psb_scg.f90
rename to krylov/psb_scg.F90
diff --git a/krylov/psb_zcg.f90 b/krylov/psb_zcg.F90
similarity index 100%
rename from krylov/psb_zcg.f90
rename to krylov/psb_zcg.F90