diff --git a/gcc/fortran/error.cc b/gcc/fortran/error.cc
index d184ffd878a..afe2e49e499 100644
--- a/gcc/fortran/error.cc
+++ b/gcc/fortran/error.cc
@@ -362,6 +362,8 @@ notify_std_msg(int std)
     return _("Obsolescent feature:");
   else if (std & GFC_STD_F95_DEL)
     return _("Deleted feature:");
+  else if (std & GFC_STD_UNSIGNED)
+    return _("Unsigned:");
   else
     gcc_unreachable ();
 }
diff --git a/gcc/testsuite/gfortran.dg/unsigned_37.f90 b/gcc/testsuite/gfortran.dg/unsigned_37.f90
new file mode 100644
index 00000000000..b11f214336a
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/unsigned_37.f90
@@ -0,0 +1,4 @@
+! { dg-do compile }
+program main
+  use iso_fortran_env, only : uint32 ! { dg-error "not in the selected standard" }
+end program main