diff --git a/modules/openapi-generator/src/main/resources/cpp-qt5-client/api-header.mustache b/modules/openapi-generator/src/main/resources/cpp-qt5-client/api-header.mustache
index 2a8b5e0f8b1..86e099dfe8b 100644
--- a/modules/openapi-generator/src/main/resources/cpp-qt5-client/api-header.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-qt5-client/api-header.mustache
@@ -10,7 +10,7 @@
 
 #include <QObject>
 #include <QByteArray>
-#include <QStringList> 
+#include <QStringList>
 #include <QList>
 #include <QNetworkAccessManager>
 
@@ -47,7 +47,7 @@ public:
     QString getParamStyleSuffix(QString style);
     QString getParamStyleDelimiter(QString style, QString name, bool isExplode);
 {{#operations}}{{#operation}}
-    void {{nickname}}({{#allParams}}const {{{dataType}}} &{{paramName}}{{^-last}}, {{/-last}}{{/allParams}});{{/operation}}{{/operations}}
+    {{#isDeprecated}}Q_DECL_DEPRECATED {{/isDeprecated}}void {{nickname}}({{#allParams}}const {{{dataType}}} &{{paramName}}{{^-last}}, {{/-last}}{{/allParams}});{{/operation}}{{/operations}}
 
 private:
     QString _scheme, _host;
diff --git a/modules/openapi-generator/src/main/resources/cpp-qt5-client/model-header.mustache b/modules/openapi-generator/src/main/resources/cpp-qt5-client/model-header.mustache
index db2ff194606..143f1424bfa 100644
--- a/modules/openapi-generator/src/main/resources/cpp-qt5-client/model-header.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-qt5-client/model-header.mustache
@@ -35,10 +35,10 @@ public:
     void fromJson{{^isEnum}}Object{{/isEnum}}{{#isEnum}}Value{{/isEnum}}(QJson{{^isEnum}}Object{{/isEnum}}{{#isEnum}}Value{{/isEnum}} json) override;
     void fromJson(QString jsonString) override;
 {{^isEnum}}{{#vars}}
-    {{{dataType}}} {{getter}}() const;
-    void {{setter}}(const {{{dataType}}} &{{name}});
-    bool is_{{name}}_Set() const;
-    bool is_{{name}}_Valid() const;
+    {{#deprecated}}Q_DECL_DEPRECATED {{/deprecated}}{{{dataType}}} {{getter}}() const;
+    {{#deprecated}}Q_DECL_DEPRECATED {{/deprecated}}void {{setter}}(const {{{dataType}}} &{{name}});
+    {{#deprecated}}Q_DECL_DEPRECATED {{/deprecated}}bool is_{{name}}_Set() const;
+    {{#deprecated}}Q_DECL_DEPRECATED {{/deprecated}}bool is_{{name}}_Valid() const;
 {{/vars}}{{/isEnum}}{{#isEnum}}
 {{#allowableValues}}
     enum class e{{classname}} {{#enumVars}}{{#-first}}{{^isString}}: int {{/isString}}{{/-first}}{{/enumVars}}{
diff --git a/samples/client/petstore/cpp-qt5/client/PFXPetApi.h b/samples/client/petstore/cpp-qt5/client/PFXPetApi.h
index fc0ea8f738a..d50826ff585 100644
--- a/samples/client/petstore/cpp-qt5/client/PFXPetApi.h
+++ b/samples/client/petstore/cpp-qt5/client/PFXPetApi.h
@@ -22,7 +22,7 @@
 
 #include <QObject>
 #include <QByteArray>
-#include <QStringList> 
+#include <QStringList>
 #include <QList>
 #include <QNetworkAccessManager>
 
@@ -60,7 +60,7 @@ public:
     void addPet(const PFXPet &body);
     void deletePet(const qint64 &pet_id, const QString &api_key);
     void findPetsByStatus(const QList<QString> &status);
-    void findPetsByTags(const QList<QString> &tags);
+    Q_DECL_DEPRECATED void findPetsByTags(const QList<QString> &tags);
     void getPetById(const qint64 &pet_id);
     void updatePet(const PFXPet &body);
     void updatePetWithForm(const qint64 &pet_id, const QString &name, const QString &status);
diff --git a/samples/client/petstore/cpp-qt5/client/PFXStoreApi.h b/samples/client/petstore/cpp-qt5/client/PFXStoreApi.h
index 55a248e60a7..781dcb955ca 100644
--- a/samples/client/petstore/cpp-qt5/client/PFXStoreApi.h
+++ b/samples/client/petstore/cpp-qt5/client/PFXStoreApi.h
@@ -21,7 +21,7 @@
 
 #include <QObject>
 #include <QByteArray>
-#include <QStringList> 
+#include <QStringList>
 #include <QList>
 #include <QNetworkAccessManager>
 
diff --git a/samples/client/petstore/cpp-qt5/client/PFXUserApi.h b/samples/client/petstore/cpp-qt5/client/PFXUserApi.h
index 9e742cf5e49..f38b2ff7427 100644
--- a/samples/client/petstore/cpp-qt5/client/PFXUserApi.h
+++ b/samples/client/petstore/cpp-qt5/client/PFXUserApi.h
@@ -21,7 +21,7 @@
 
 #include <QObject>
 #include <QByteArray>
-#include <QStringList> 
+#include <QStringList>
 #include <QList>
 #include <QNetworkAccessManager>