diff --git a/mie/type/type-definition.c b/mie/type/type-definition.c
index e550156..eb157a9 100644
--- a/mie/type/type-definition.c
+++ b/mie/type/type-definition.c
@@ -10,6 +10,8 @@ struct mie_type_definition *mie_type_definition_create(
 		return NULL;
 	}
 
+	memset(out, 0x0, sizeof *out);
+
 	out->ty_name = b_strdup(name);
 	if (!out->ty_name) {
 		free(out);