diff --git a/core/src/km_core_state_api.cpp b/core/src/km_core_state_api.cpp
index 6fa30057fa..dbd49f7bcb 100644
--- a/core/src/km_core_state_api.cpp
+++ b/core/src/km_core_state_api.cpp
@@ -378,7 +378,7 @@ state_should_invalidate_context(km_core_state *state,
                      km_core_virtual_key vk,
                      uint16_t modifier_state,
                      uint8_t is_key_down,
-                     uint16_t event_flags) {
+                     uint16_t _kmn_unused(event_flags)) {
   // if emit_keystroke is present, check if a context reset is needed
   if (state_has_action_type(state, KM_CORE_IT_EMIT_KEYSTROKE)) {
     if (vk == KM_CORE_VKEY_BKSP && state->context().empty()) {