diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index 45e88b15fbc9..dbb635e9be9b 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -212,7 +212,7 @@ apiTemplateFiles are for API outputs only (controllers/handlers).
     // How to encode special characters like $
     // They are translated to words like "Dollar" and prefixed with '
     // Then translated back during JSON encoding and decoding
-    protected Map<String, String> specialCharReplacements = new HashMap<String, String>();
+    protected Map<String, String> specialCharReplacements = new LinkedHashMap<String, String>();
     // When a model is an alias for a simple type
     protected Map<String, String> typeAliases = null;
     protected Boolean prependFormOrBodyParameters = false;
@@ -474,7 +474,7 @@ protected Map<String, Schema> getModelNameToSchemaCache() {
      * @return map of all models indexed by names
      */
     public Map<String, CodegenModel> getAllModels(Map<String, Object> objs) {
-        Map<String, CodegenModel> allModels = new HashMap<String, CodegenModel>();
+        Map<String, CodegenModel> allModels = new LinkedHashMap<String, CodegenModel>();
         for (Entry<String, Object> entry : objs.entrySet()) {
             String modelName = toModelName(entry.getKey());
             Map<String, Object> inner = (Map<String, Object>) entry.getValue();