diff --git a/include/wlr/types/wlr_seat.h b/include/wlr/types/wlr_seat.h
index ea5d532f..f4840c89 100644
--- a/include/wlr/types/wlr_seat.h
+++ b/include/wlr/types/wlr_seat.h
@@ -61,7 +61,7 @@ struct wlr_pointer_grab_interface {
 			uint32_t button, uint32_t state);
 	void (*axis)(struct wlr_seat_pointer_grab *grab, uint32_t time,
 			enum wlr_axis_orientation orientation, double value,
-			int32_t value_discrete);
+			int32_t value_discrete, enum wlr_axis_source source);
 	void (*cancel)(struct wlr_seat_pointer_grab *grab);
 };
 
@@ -302,7 +302,7 @@ uint32_t wlr_seat_pointer_send_button(struct wlr_seat *wlr_seat, uint32_t time,
  **/
 void wlr_seat_pointer_send_axis(struct wlr_seat *wlr_seat, uint32_t time,
 		enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete);
+		int32_t value_discrete, enum wlr_axis_source source);
 
 /**
  * Start a grab of the pointer of this seat. The grabber is responsible for
@@ -344,7 +344,7 @@ uint32_t wlr_seat_pointer_notify_button(struct wlr_seat *wlr_seat,
  */
 void wlr_seat_pointer_notify_axis(struct wlr_seat *wlr_seat, uint32_t time,
 		enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete);
+		int32_t value_discrete, enum wlr_axis_source source);
 
 /**
  * Whether or not the pointer has a grab other than the default grab.
diff --git a/rootston/cursor.c b/rootston/cursor.c
index 98ecef4f..55b145e2 100644
--- a/rootston/cursor.c
+++ b/rootston/cursor.c
@@ -313,7 +313,7 @@ void roots_cursor_handle_button(struct roots_cursor *cursor,
 void roots_cursor_handle_axis(struct roots_cursor *cursor,
 		struct wlr_event_pointer_axis *event) {
 	wlr_seat_pointer_notify_axis(cursor->seat->seat, event->time_msec,
-		event->orientation, event->delta, event->delta_discrete);
+		event->orientation, event->delta, event->delta_discrete, event->source);
 }
 
 void roots_cursor_handle_touch_down(struct roots_cursor *cursor,
diff --git a/types/data_device/wlr_drag.c b/types/data_device/wlr_drag.c
index 5f4cb03d..331fba2f 100644
--- a/types/data_device/wlr_drag.c
+++ b/types/data_device/wlr_drag.c
@@ -192,7 +192,7 @@ static uint32_t drag_handle_pointer_button(struct wlr_seat_pointer_grab *grab,
 
 static void drag_handle_pointer_axis(struct wlr_seat_pointer_grab *grab,
 		uint32_t time, enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete) {
+		int32_t value_discrete, enum wlr_axis_source source) {
 	// This space is intentionally left blank
 }
 
diff --git a/types/seat/wlr_seat_pointer.c b/types/seat/wlr_seat_pointer.c
index 8859c275..3271c090 100644
--- a/types/seat/wlr_seat_pointer.c
+++ b/types/seat/wlr_seat_pointer.c
@@ -26,9 +26,9 @@ static uint32_t default_pointer_button(struct wlr_seat_pointer_grab *grab,
 
 static void default_pointer_axis(struct wlr_seat_pointer_grab *grab,
 		uint32_t time, enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete) {
+		int32_t value_discrete, enum wlr_axis_source source) {
 	wlr_seat_pointer_send_axis(grab->seat, time, orientation, value,
-		value_discrete);
+		value_discrete, source);
 }
 
 static void default_pointer_cancel(struct wlr_seat_pointer_grab *grab) {
@@ -227,7 +227,7 @@ uint32_t wlr_seat_pointer_send_button(struct wlr_seat *wlr_seat, uint32_t time,
 
 void wlr_seat_pointer_send_axis(struct wlr_seat *wlr_seat, uint32_t time,
 		enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete) {
+		int32_t value_discrete, enum wlr_axis_source source) {
 	struct wlr_seat_client *client = wlr_seat->pointer_state.focused_client;
 	if (client == NULL) {
 		return;
@@ -241,6 +241,9 @@ void wlr_seat_pointer_send_axis(struct wlr_seat *wlr_seat, uint32_t time,
 
 		uint32_t version = wl_resource_get_version(resource);
 
+		if (version >= WL_POINTER_AXIS_SOURCE_SINCE_VERSION) {
+			wl_pointer_send_axis_source(resource, source);
+		}
 		if (value) {
 			if (value_discrete &&
 					version >= WL_POINTER_AXIS_DISCRETE_SINCE_VERSION) {
@@ -315,10 +318,11 @@ uint32_t wlr_seat_pointer_notify_button(struct wlr_seat *wlr_seat,
 
 void wlr_seat_pointer_notify_axis(struct wlr_seat *wlr_seat, uint32_t time,
 		enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete) {
+		int32_t value_discrete, enum wlr_axis_source source) {
 	clock_gettime(CLOCK_MONOTONIC, &wlr_seat->last_event);
 	struct wlr_seat_pointer_grab *grab = wlr_seat->pointer_state.grab;
-	grab->interface->axis(grab, time, orientation, value, value_discrete);
+	grab->interface->axis(grab, time, orientation, value, value_discrete,
+		source);
 }
 
 bool wlr_seat_pointer_has_grab(struct wlr_seat *seat) {
diff --git a/types/wlr_wl_shell.c b/types/wlr_wl_shell.c
index 423c048b..05f9f19c 100644
--- a/types/wlr_wl_shell.c
+++ b/types/wlr_wl_shell.c
@@ -94,9 +94,9 @@ static void shell_pointer_grab_cancel(struct wlr_seat_pointer_grab *grab) {
 
 static void shell_pointer_grab_axis(struct wlr_seat_pointer_grab *grab,
 		uint32_t time, enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete) {
+		int32_t value_discrete, enum wlr_axis_source source) {
 	wlr_seat_pointer_send_axis(grab->seat, time, orientation, value,
-		value_discrete);
+		value_discrete, source);
 }
 
 static const struct wlr_pointer_grab_interface shell_pointer_grab_impl = {
diff --git a/types/wlr_xdg_shell.c b/types/wlr_xdg_shell.c
index abc80e83..b626b772 100644
--- a/types/wlr_xdg_shell.c
+++ b/types/wlr_xdg_shell.c
@@ -78,9 +78,9 @@ static uint32_t xdg_pointer_grab_button(struct wlr_seat_pointer_grab *grab,
 
 static void xdg_pointer_grab_axis(struct wlr_seat_pointer_grab *grab,
 		uint32_t time, enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete) {
+		int32_t value_discrete, enum wlr_axis_source source) {
 	wlr_seat_pointer_send_axis(grab->seat, time, orientation, value,
-		value_discrete);
+		value_discrete, source);
 }
 
 static void xdg_pointer_grab_cancel(struct wlr_seat_pointer_grab *grab) {
diff --git a/types/wlr_xdg_shell_v6.c b/types/wlr_xdg_shell_v6.c
index 548051c2..29e4e605 100644
--- a/types/wlr_xdg_shell_v6.c
+++ b/types/wlr_xdg_shell_v6.c
@@ -88,9 +88,9 @@ static uint32_t xdg_pointer_grab_button(struct wlr_seat_pointer_grab *grab,
 
 static void xdg_pointer_grab_axis(struct wlr_seat_pointer_grab *grab,
 		uint32_t time, enum wlr_axis_orientation orientation, double value,
-		int32_t value_discrete) {
+		int32_t value_discrete, enum wlr_axis_source source) {
 	wlr_seat_pointer_send_axis(grab->seat, time, orientation, value,
-		value_discrete);
+		value_discrete, source);
 }
 
 static void xdg_pointer_grab_cancel(struct wlr_seat_pointer_grab *grab) {