diff --git a/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_Mutual_Auth/DemoTasks/MutualAuthHTTPExample.c b/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_Mutual_Auth/DemoTasks/MutualAuthHTTPExample.c
index eb652c3b95..9bd1f33ae8 100644
--- a/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_Mutual_Auth/DemoTasks/MutualAuthHTTPExample.c
+++ b/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_Mutual_Auth/DemoTasks/MutualAuthHTTPExample.c
@@ -200,6 +200,10 @@ static BaseType_t prvSendHttpRequest( const TransportInterface_t * pxTransportIn
 
 /*-----------------------------------------------------------*/
 
+extern BaseType_t xPlatformIsNetworkUp( void );
+
+/*-----------------------------------------------------------*/
+
 /*
  * @brief Create the task that demonstrates the HTTP API Demo over a
  * mutually-authenticated network connection with an HTTP server.
diff --git a/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_Plaintext/DemoTasks/PlainTextHTTPExample.c b/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_Plaintext/DemoTasks/PlainTextHTTPExample.c
index 52914bcd65..039375be0f 100644
--- a/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_Plaintext/DemoTasks/PlainTextHTTPExample.c
+++ b/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_Plaintext/DemoTasks/PlainTextHTTPExample.c
@@ -260,6 +260,10 @@ static BaseType_t prvSendHttpRequest( const TransportInterface_t * pxTransportIn
 
 /*-----------------------------------------------------------*/
 
+extern BaseType_t xPlatformIsNetworkUp( void );
+
+/*-----------------------------------------------------------*/
+
 /*
  * @brief Create the task that demonstrates the HTTP API Demo over a
  * mutually-authenticated network connection with an HTTP server.
diff --git a/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_S3_Download_Multithreaded/DemoTasks/S3DownloadMultithreadedHTTPExample.c b/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_S3_Download_Multithreaded/DemoTasks/S3DownloadMultithreadedHTTPExample.c
index cd8359627b..e28bcc8a89 100644
--- a/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_S3_Download_Multithreaded/DemoTasks/S3DownloadMultithreadedHTTPExample.c
+++ b/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_S3_Download_Multithreaded/DemoTasks/S3DownloadMultithreadedHTTPExample.c
@@ -429,6 +429,10 @@ static BaseType_t prvDownloadLoop( void );
 
 /*-----------------------------------------------------------*/
 
+extern BaseType_t xPlatformIsNetworkUp( void );
+
+/*-----------------------------------------------------------*/
+
 /*
  * @brief Create task to demonstrate the HTTP API over a server-authenticated
  * network connection with a server.
diff --git a/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_S3_Upload/DemoTasks/S3UploadHTTPExample.c b/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_S3_Upload/DemoTasks/S3UploadHTTPExample.c
index e4a50471fc..e1bbc408c7 100644
--- a/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_S3_Upload/DemoTasks/S3UploadHTTPExample.c
+++ b/FreeRTOS-Plus/Demo/coreHTTP_Windows_Simulator/HTTP_S3_Upload/DemoTasks/S3UploadHTTPExample.c
@@ -295,6 +295,10 @@ static BaseType_t prvVerifyS3ObjectFileSize( const TransportInterface_t * pxTran
 
 /*-----------------------------------------------------------*/
 
+extern BaseType_t xPlatformIsNetworkUp( void );
+
+/*-----------------------------------------------------------*/
+
 /*
  * @brief Create the task that demonstrates the HTTP API Demo over a
  * server-authenticated network connection with an HTTP server.