diff --git a/codegen/smithy-dafny-codegen/src/main/java/software/amazon/polymorph/smithygo/codegen/ValidationGenerator.java b/codegen/smithy-dafny-codegen/src/main/java/software/amazon/polymorph/smithygo/codegen/ValidationGenerator.java
index 60b17ca33..376077c6b 100644
--- a/codegen/smithy-dafny-codegen/src/main/java/software/amazon/polymorph/smithygo/codegen/ValidationGenerator.java
+++ b/codegen/smithy-dafny-codegen/src/main/java/software/amazon/polymorph/smithygo/codegen/ValidationGenerator.java
@@ -4,6 +4,7 @@
 
 import java.math.BigDecimal;
 import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Optional;
 import software.amazon.polymorph.smithygo.localservice.nameresolver.SmithyNameResolver;
@@ -45,9 +46,9 @@ public class ValidationGenerator {
     }
     """;
   private static final Map<MemberShape, String> validationFuncMap =
-    new HashMap<>();
+    new LinkedHashMap<>();
   private static final Map<MemberShape, String> validationFuncInputTypeMap =
-    new HashMap<>();
+    new LinkedHashMap<>();
 
   public ValidationGenerator(
     final GenerationContext context,