diff --git a/modules/openapi-generator/src/main/resources/cpp-pistache-server/helpers-header.mustache b/modules/openapi-generator/src/main/resources/cpp-pistache-server/helpers-header.mustache
index 4ea12ef9481..328dc2ee2b8 100644
--- a/modules/openapi-generator/src/main/resources/cpp-pistache-server/helpers-header.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-pistache-server/helpers-header.mustache
@@ -8,12 +8,13 @@
 #ifndef {{prefix}}Helpers_H_
 #define {{prefix}}Helpers_H_
 
+#include <cstdint>
 #include <ctime>
-#include <string>
-#include <sstream>
-#include <vector>
 #include <map>
 #include <set>
+#include <sstream>
+#include <string>
+#include <vector>
 
 namespace {{helpersNamespace}}
 {
diff --git a/samples/server/petstore/cpp-pistache-everything/model/Helpers.h b/samples/server/petstore/cpp-pistache-everything/model/Helpers.h
index 0ab06c03df4..84354f85a2f 100644
--- a/samples/server/petstore/cpp-pistache-everything/model/Helpers.h
+++ b/samples/server/petstore/cpp-pistache-everything/model/Helpers.h
@@ -18,12 +18,13 @@
 #ifndef Helpers_H_
 #define Helpers_H_
 
+#include <cstdint>
 #include <ctime>
-#include <string>
-#include <sstream>
-#include <vector>
 #include <map>
 #include <set>
+#include <sstream>
+#include <string>
+#include <vector>
 
 namespace org::openapitools::server::helpers
 {
diff --git a/samples/server/petstore/cpp-pistache-nested-schema-refs/model/Helpers.h b/samples/server/petstore/cpp-pistache-nested-schema-refs/model/Helpers.h
index 9637a1cb6af..9c2581081fc 100644
--- a/samples/server/petstore/cpp-pistache-nested-schema-refs/model/Helpers.h
+++ b/samples/server/petstore/cpp-pistache-nested-schema-refs/model/Helpers.h
@@ -18,12 +18,13 @@
 #ifndef Helpers_H_
 #define Helpers_H_
 
+#include <cstdint>
 #include <ctime>
-#include <string>
-#include <sstream>
-#include <vector>
 #include <map>
 #include <set>
+#include <sstream>
+#include <string>
+#include <vector>
 
 namespace org::openapitools::server::helpers
 {
diff --git a/samples/server/petstore/cpp-pistache/model/Helpers.h b/samples/server/petstore/cpp-pistache/model/Helpers.h
index 0ab06c03df4..84354f85a2f 100644
--- a/samples/server/petstore/cpp-pistache/model/Helpers.h
+++ b/samples/server/petstore/cpp-pistache/model/Helpers.h
@@ -18,12 +18,13 @@
 #ifndef Helpers_H_
 #define Helpers_H_
 
+#include <cstdint>
 #include <ctime>
-#include <string>
-#include <sstream>
-#include <vector>
 #include <map>
 #include <set>
+#include <sstream>
+#include <string>
+#include <vector>
 
 namespace org::openapitools::server::helpers
 {