diff --git a/include/wlr/types/wlr_seat.h b/include/wlr/types/wlr_seat.h
index 2f5fd31b..b94c0435 100644
--- a/include/wlr/types/wlr_seat.h
+++ b/include/wlr/types/wlr_seat.h
@@ -110,8 +110,8 @@ struct wlr_seat_keyboard_grab;
 
 struct wlr_keyboard_grab_interface {
 	void (*enter)(struct wlr_seat_keyboard_grab *grab,
-			struct wlr_surface *surface, uint32_t keycodes[],
-			size_t num_keycodes, struct wlr_keyboard_modifiers *modifiers);
+			struct wlr_surface *surface, const uint32_t keycodes[],
+			size_t num_keycodes, const struct wlr_keyboard_modifiers *modifiers);
 	void (*clear_focus)(struct wlr_seat_keyboard_grab *grab);
 	void (*key)(struct wlr_seat_keyboard_grab *grab, uint32_t time_msec,
 			uint32_t key, uint32_t state);
@@ -549,8 +549,8 @@ void wlr_seat_keyboard_notify_modifiers(struct wlr_seat *seat,
  * keyboard.
  */
 void wlr_seat_keyboard_notify_enter(struct wlr_seat *seat,
-		struct wlr_surface *surface, uint32_t keycodes[], size_t num_keycodes,
-		struct wlr_keyboard_modifiers *modifiers);
+		struct wlr_surface *surface, const uint32_t keycodes[], size_t num_keycodes,
+		const struct wlr_keyboard_modifiers *modifiers);
 
 /**
  * Notify the seat of a keyboard leave event to the currently-focused surface.
diff --git a/types/data_device/wlr_drag.c b/types/data_device/wlr_drag.c
index f0b6cfa6..d81972ab 100644
--- a/types/data_device/wlr_drag.c
+++ b/types/data_device/wlr_drag.c
@@ -311,8 +311,8 @@ static const struct wlr_touch_grab_interface
 };
 
 static void drag_handle_keyboard_enter(struct wlr_seat_keyboard_grab *grab,
-		struct wlr_surface *surface, uint32_t keycodes[], size_t num_keycodes,
-		struct wlr_keyboard_modifiers *modifiers) {
+		struct wlr_surface *surface, const uint32_t keycodes[], size_t num_keycodes,
+		const struct wlr_keyboard_modifiers *modifiers) {
 	// nothing has keyboard focus during drags
 }
 
diff --git a/types/seat/wlr_seat_keyboard.c b/types/seat/wlr_seat_keyboard.c
index 65acec33..51456f8b 100644
--- a/types/seat/wlr_seat_keyboard.c
+++ b/types/seat/wlr_seat_keyboard.c
@@ -10,8 +10,8 @@
 #include "types/wlr_seat.h"
 
 static void default_keyboard_enter(struct wlr_seat_keyboard_grab *grab,
-		struct wlr_surface *surface, uint32_t keycodes[], size_t num_keycodes,
-		struct wlr_keyboard_modifiers *modifiers) {
+		struct wlr_surface *surface, const uint32_t keycodes[], size_t num_keycodes,
+		const struct wlr_keyboard_modifiers *modifiers) {
 	wlr_seat_keyboard_enter(grab->seat, surface, keycodes, num_keycodes, modifiers);
 }
 
@@ -298,8 +298,8 @@ void wlr_seat_keyboard_enter(struct wlr_seat *seat,
 }
 
 void wlr_seat_keyboard_notify_enter(struct wlr_seat *seat,
-		struct wlr_surface *surface, uint32_t keycodes[], size_t num_keycodes,
-		struct wlr_keyboard_modifiers *modifiers) {
+		struct wlr_surface *surface, const uint32_t keycodes[], size_t num_keycodes,
+		const struct wlr_keyboard_modifiers *modifiers) {
 	// NULL surfaces are prohibited in the grab-compatible API. Use
 	// wlr_seat_keyboard_notify_clear_focus() instead.
 	assert(surface);
diff --git a/types/xdg_shell/wlr_xdg_popup.c b/types/xdg_shell/wlr_xdg_popup.c
index 4e0fae10..b528c0db 100644
--- a/types/xdg_shell/wlr_xdg_popup.c
+++ b/types/xdg_shell/wlr_xdg_popup.c
@@ -106,8 +106,8 @@ static const struct wlr_pointer_grab_interface xdg_pointer_grab_impl = {
 };
 
 static void xdg_keyboard_grab_enter(struct wlr_seat_keyboard_grab *grab,
-		struct wlr_surface *surface, uint32_t keycodes[], size_t num_keycodes,
-		struct wlr_keyboard_modifiers *modifiers) {
+		struct wlr_surface *surface, const uint32_t keycodes[], size_t num_keycodes,
+		const struct wlr_keyboard_modifiers *modifiers) {
 	// keyboard focus should remain on the popup
 }