diff --git a/samples/client/petstore/c/api/PetAPI.h b/samples/client/petstore/c/api/PetAPI.h
index c24b44305cf5..f223b60a0b8d 100644
--- a/samples/client/petstore/c/api/PetAPI.h
+++ b/samples/client/petstore/c/api/PetAPI.h
@@ -8,10 +8,6 @@
 #include "../model/api_response.h"
 #include "../model/pet.h"
 
-#undef stdin
-#undef stderr
-#undef stdout
-
 // Enum STATUS for PetAPI_findPetsByStatus
 typedef enum  { openapi_petstore_findPetsByStatus_STATUS_NULL = 0, openapi_petstore_findPetsByStatus_STATUS_available, openapi_petstore_findPetsByStatus_STATUS_pending, openapi_petstore_findPetsByStatus_STATUS_sold } openapi_petstore_findPetsByStatus_status_e;
 
diff --git a/samples/client/petstore/c/api/StoreAPI.h b/samples/client/petstore/c/api/StoreAPI.h
index 21985044c200..43bdf7583767 100644
--- a/samples/client/petstore/c/api/StoreAPI.h
+++ b/samples/client/petstore/c/api/StoreAPI.h
@@ -7,10 +7,6 @@
 #include "../include/binary.h"
 #include "../model/order.h"
 
-#undef stdin
-#undef stderr
-#undef stdout
-
 
 // Delete purchase order by ID
 //
diff --git a/samples/client/petstore/c/api/UserAPI.h b/samples/client/petstore/c/api/UserAPI.h
index d6e43056f13b..b0a60accdab9 100644
--- a/samples/client/petstore/c/api/UserAPI.h
+++ b/samples/client/petstore/c/api/UserAPI.h
@@ -7,10 +7,6 @@
 #include "../include/binary.h"
 #include "../model/user.h"
 
-#undef stdin
-#undef stderr
-#undef stdout
-
 
 // Create user
 //