diff --git a/proto/zmk/keymap.options.in b/proto/zmk/keymap.options.in
new file mode 100644
index 0000000..8ad0aad
--- /dev/null
+++ b/proto/zmk/keymap.options.in
@@ -0,0 +1 @@
+zmk.keymap.SetLayerPropsRequest.name max_size:@CONFIG_ZMK_KEYMAP_LAYER_NAME_MAX_LEN@ fixed_length:true