diff --git a/src/runtime/stack.h b/src/runtime/stack.h
index adaab82a..349f245a 100644
--- a/src/runtime/stack.h
+++ b/src/runtime/stack.h
@@ -28,6 +28,7 @@ size_t ts_stack_right_position(const TSStack *stack);
 
 #define TS_STACK_FROM_TOP(stack, entry, index)               \
   size_t index = stack.size - 1;                             \
+  (void)index;                                               \
   for (TSStackEntry *entry = stack.entries + stack.size - 1; \
        entry >= stack.entries; entry-- && index--)