diff --git a/base/src/main/java/org/aya/core/visitor/Subst.java b/base/src/main/java/org/aya/core/visitor/Subst.java
index 49fd5c6604..9cedb76b47 100644
--- a/base/src/main/java/org/aya/core/visitor/Subst.java
+++ b/base/src/main/java/org/aya/core/visitor/Subst.java
@@ -42,7 +42,7 @@ public record Subst(
   }));
 
   public Subst() {
-    this(MutableMap.create());
+    this(MutableLinkedHashMap.of());
   }
 
   public Subst(@NotNull AnyVar var, @NotNull Term term) {