diff --git a/res/ui/ui.glade b/res/ui/ui.glade
index de78779..2fb0dff 100644
--- a/res/ui/ui.glade
+++ b/res/ui/ui.glade
@@ -1672,6 +1672,22 @@
                         <property name="position">2</property>
                       </packing>
                     </child>
+                    <child>
+                      <object class="GtkCheckButton" id="invert_scroll">
+                        <property name="label" translatable="yes">Invert Scroll Direction</property>
+                        <property name="visible">True</property>
+                        <property name="can-focus">True</property>
+                        <property name="receives-default">False</property>
+                        <property name="xalign">0</property>
+                        <property name="draw-indicator">True</property>
+                        <signal name="toggled" handler="on_setting_toggled" swapped="no"/>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">3</property>
+                      </packing>
+                    </child>
                     <child>
                       <object class="GtkBox">
                         <property name="visible">True</property>
@@ -1728,7 +1744,7 @@
                       <packing>
                         <property name="expand">False</property>
                         <property name="fill">True</property>
-                        <property name="position">3</property>
+                        <property name="position">4</property>
                       </packing>
                     </child>
                     <child>
@@ -1743,7 +1759,7 @@
                       <packing>
                         <property name="expand">False</property>
                         <property name="fill">True</property>
-                        <property name="position">4</property>
+                        <property name="position">5</property>
                       </packing>
                     </child>
                   </object>
diff --git a/src/ui/input.c b/src/ui/input.c
index 9edafa1..56fa601 100644
--- a/src/ui/input.c
+++ b/src/ui/input.c
@@ -18,6 +18,7 @@
 #include "gfx.h"
 #include "satellite.h"
 #include "search.h"
+#include "setting.h"
 #include "type.h"
 #include "ui.h"
 
@@ -134,7 +135,7 @@ gboolean on_glarea_scroll_event(GtkWidget *widget, GdkEvent *event, gpointer use
 	(void)user_data;
 	GdkEventScroll *scroll = &event->scroll;
 
-	camera_zoom(&e_camera, scroll->delta_y * 0.2);
+	camera_zoom(&e_camera, scroll->delta_y * 0.2 * (gs_invert_scroll ? 1 : -1));
 
 	return TRUE;
 }
diff --git a/src/ui/setting.c b/src/ui/setting.c
index 2ebc1ae..a25f1a6 100644
--- a/src/ui/setting.c
+++ b/src/ui/setting.c
@@ -25,7 +25,7 @@ struct Setting {
 	gboolean *val;
 };
 
-struct Setting settings[3] = {
+struct Setting settings[] = {
 	{
 		.id = "lighting",
 		.val = &gs_lighting,
@@ -38,11 +38,16 @@ struct Setting settings[3] = {
 		.id = "local_time",
 		.val = &gs_gmt,
 	},
+	{
+		.id = "invert_scroll",
+		.val = &gs_invert_scroll,
+	},
 };
 
 gboolean gs_gmt = FALSE;
 gboolean gs_clouds = TRUE;
 gboolean gs_lighting = TRUE;
+gboolean gs_invert_scroll = FALSE;
 enum ReferenceFrame gs_reference_frame = REFERENCE_FRAME_FIXED;
 
 static GtkWindow *window_settings;
@@ -75,9 +80,9 @@ void on_setting_toggled(GtkToggleButton *togglebutton, gpointer user_data)
 {
 	(void)user_data;
 	unsigned i;
-	for (i = 0; i < 3 && settings[i].button != togglebutton; i++)
+	for (i = 0; i < 4 && settings[i].button != togglebutton; i++)
 		;
-	*settings[i].val = !*settings[i].val;
+	*settings[i].val = gtk_toggle_button_get_active(togglebutton);
 }
 
 void on_fetch_data_clicked(GtkButton *button, gpointer user_data)
@@ -116,6 +121,6 @@ void setting_init(GtkBuilder *builder)
 	gtk_label_set_text(about, ABOUT_STRING);
 
 	unsigned i;
-	for (i = 0; i < 3; i++)
+	for (i = 0; i < 4; i++)
 		settings[i].button = GTK_TOGGLE_BUTTON(gtk_builder_get_object(builder, settings[i].id));
 }
diff --git a/src/ui/setting.h b/src/ui/setting.h
index 4aba140..2b0523e 100644
--- a/src/ui/setting.h
+++ b/src/ui/setting.h
@@ -26,6 +26,7 @@ enum ReferenceFrame {
 extern gboolean gs_gmt;
 extern gboolean gs_clouds;
 extern gboolean gs_lighting;
+extern gboolean gs_invert_scroll;
 extern enum ReferenceFrame gs_reference_frame;
 
 void setting_init(GtkBuilder *builder);