diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 69e9009d250..ef6200c6519 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,8 @@
+2019-04-13  Dominique d'Humieres  <dominiq@gcc.gnu.org>
+
+	PR fortran/79842
+	* module.c (gfc_use_module): use complete sentences.
+
 2019-04-11  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR translation/89939
diff --git a/gcc/fortran/module.c b/gcc/fortran/module.c
index 3d4b17b599e..3e1ffedd8ee 100644
--- a/gcc/fortran/module.c
+++ b/gcc/fortran/module.c
@@ -7144,8 +7144,12 @@ gfc_use_module (gfc_use_list *module)
   for (p = gfc_state_stack; p; p = p->previous)
     if ((p->state == COMP_MODULE || p->state == COMP_SUBMODULE)
 	 && strcmp (p->sym->name, module_name) == 0)
-      gfc_fatal_error ("Cannot USE the same %smodule we're building",
-		       p->state == COMP_SUBMODULE ? "sub" : "");
+      {
+	if (p->state == COMP_SUBMODULE)
+	  gfc_fatal_error ("Cannot USE a submodule that is currently built");
+	else
+	  gfc_fatal_error ("Cannot USE a module that is currently built");
+      }
 
   init_pi_tree ();
   init_true_name_tree ();