diff --git a/i3-config-wizard/xcb.c b/i3-config-wizard/xcb.c
index e5fdee92..4f8eb4da 100644
--- a/i3-config-wizard/xcb.c
+++ b/i3-config-wizard/xcb.c
@@ -24,39 +24,6 @@
 extern xcb_window_t root;
 unsigned int xcb_numlock_mask;
 
-/*
- * Returns the mask for Mode_switch (to be used for looking up keysymbols by
- * keycode).
- *
- */
-uint32_t get_mod_mask(xcb_connection_t *conn, uint32_t keycode) {
-	xcb_key_symbols_t *symbols = xcb_key_symbols_alloc(conn);
-
-	xcb_get_modifier_mapping_reply_t *modmap_r;
-	xcb_keycode_t *modmap, kc;
-	xcb_keycode_t *modeswitchcodes = xcb_key_symbols_get_keycode(symbols, keycode);
-	if (modeswitchcodes == NULL)
-		return 0;
-
-	modmap_r = xcb_get_modifier_mapping_reply(conn, xcb_get_modifier_mapping(conn), NULL);
-	modmap = xcb_get_modifier_mapping_keycodes(modmap_r);
-
-	for (int i = 0; i < 8; i++)
-		for (int j = 0; j < modmap_r->keycodes_per_modifier; j++) {
-			kc = modmap[i * modmap_r->keycodes_per_modifier + j];
-			for (xcb_keycode_t *ktest = modeswitchcodes; *ktest; ktest++) {
-				if (*ktest != kc)
-					continue;
-
-				free(modeswitchcodes);
-				free(modmap_r);
-				return (1 << i);
-			}
-		}
-
-	return 0;
-}
-
 /*
  * Opens the window we use for input/output and maps it
  *
diff --git a/i3-config-wizard/xcb.h b/i3-config-wizard/xcb.h
index f0416aae..c2ecedf8 100644
--- a/i3-config-wizard/xcb.h
+++ b/i3-config-wizard/xcb.h
@@ -10,7 +10,6 @@
 
 extern unsigned int xcb_numlock_mask;
 
-uint32_t get_mod_mask(xcb_connection_t *conn, uint32_t keycode);
 xcb_window_t open_input_window(xcb_connection_t *conn, uint32_t width, uint32_t height);
 int get_font_id(xcb_connection_t *conn, char *pattern, int *font_height);
 /**