1 files changed, 2 insertions, 2 deletions

diff --git a/src/pgtkterm.c b/src/pgtkterm.c
index 74614eae6eb..3093083a82c 100644
--- a/src/pgtkterm.c
+++ b/src/pgtkterm.c
@@ -6264,9 +6264,9 @@ scroll_event (GtkWidget * widget, GdkEvent * event, gpointer * user_data)
                           ? HORIZ_WHEEL_EVENT
                           : WHEEL_EVENT);
           inev.ie.modifiers |= (inev.ie.kind == HORIZ_WHEEL_EVENT
-                                ? (delta_x >= 0 ? down_modifier : up_modifier)
+                                ? (delta_x >= 0 ? up_modifier : down_modifier)
                                 : (delta_y >= 0 ? down_modifier : up_modifier));
-          inev.ie.arg = list3 (Qnil, make_float (delta_x * 100),
+          inev.ie.arg = list3 (Qnil, make_float (-delta_x * 100),
                                make_float (-delta_y * 100));
         }
       else