diff --git a/include/sway/config.h b/include/sway/config.h
index 4a6bb780..0f74b439 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -101,6 +101,9 @@ struct input_config {
 	char *xkb_rules;
 	char *xkb_variant;
 
+	int xkb_numlock;
+	int xkb_capslock;
+
 	struct input_config_mapped_from_region *mapped_from_region;
 	char *mapped_to_output;
 
diff --git a/sway/config/input.c b/sway/config/input.c
index 8d687a6d..9885e85c 100644
--- a/sway/config/input.c
+++ b/sway/config/input.c
@@ -33,6 +33,8 @@ struct input_config *new_input_config(const char* identifier) {
 	input->left_handed = INT_MIN;
 	input->repeat_delay = INT_MIN;
 	input->repeat_rate = INT_MIN;
+	input->xkb_numlock = INT_MIN;
+	input->xkb_capslock = INT_MIN;
 
 	return input;
 }
@@ -104,6 +106,12 @@ void merge_input_config(struct input_config *dst, struct input_config *src) {
 		free(dst->xkb_variant);
 		dst->xkb_variant = strdup(src->xkb_variant);
 	}
+	if (src->xkb_numlock != INT_MIN) {
+		dst->xkb_numlock = src->xkb_numlock;
+	}
+	if (src->xkb_capslock != INT_MIN) {
+		dst->xkb_capslock = src->xkb_capslock;
+	}
 	if (src->mapped_from_region) {
 		free(dst->mapped_from_region);
 		dst->mapped_from_region =
diff --git a/sway/input/keyboard.c b/sway/input/keyboard.c
index 49241db8..36c5a064 100644
--- a/sway/input/keyboard.c
+++ b/sway/input/keyboard.c
@@ -3,6 +3,7 @@
 #include <wlr/backend/multi.h>
 #include <wlr/backend/session.h>
 #include <wlr/types/wlr_idle.h>
+#include <wlr/interfaces/wlr_keyboard.h>
 #include "sway/commands.h"
 #include "sway/desktop/transaction.h"
 #include "sway/input/input-manager.h"
@@ -385,6 +386,23 @@ void sway_keyboard_configure(struct sway_keyboard *keyboard) {
 	keyboard->keymap = keymap;
 	wlr_keyboard_set_keymap(wlr_device->keyboard, keyboard->keymap);
 
+	xkb_mod_mask_t locked_mods = 0;
+	if (!input_config || input_config->xkb_numlock != 0) {
+		xkb_mod_index_t mod_index = xkb_map_mod_get_index(keymap, XKB_MOD_NAME_NUM);
+		if (mod_index != XKB_MOD_INVALID) {
+		       locked_mods |= (uint32_t)1 << mod_index;
+		}
+	}
+	if (input_config && input_config->xkb_capslock > 0) {
+		xkb_mod_index_t mod_index = xkb_map_mod_get_index(keymap, XKB_MOD_NAME_CAPS);
+		if (mod_index != XKB_MOD_INVALID) {
+		       locked_mods |= (uint32_t)1 << mod_index;
+		}
+	}
+	if (locked_mods) {
+		wlr_keyboard_notify_modifiers(wlr_device->keyboard, 0, 0, locked_mods, 0);
+	}
+
 	if (input_config && input_config->repeat_delay != INT_MIN
 			&& input_config->repeat_rate != INT_MIN) {
 		wlr_keyboard_set_repeat_info(wlr_device->keyboard,