diff --git a/mie/dialect/index/index-cache.c b/mie/dialect/index/index-cache.c
index 366fea6..ede58d7 100644
--- a/mie/dialect/index/index-cache.c
+++ b/mie/dialect/index/index-cache.c
@@ -26,6 +26,8 @@ static struct index_cache_entry *index_cache_entry_create(
 		return NULL;
 	}
 
+	memset(out, 0x0, sizeof *out);
+
 	out->e_value.i_value = val;
 	out->e_value.i_base.v_type = mie_ctx_get_type(ctx, "index", "index");
 	if (!out->e_value.i_base.v_type) {