diff --git a/src/d_netfil.c b/src/d_netfil.c
index 505a2fefd..252aaabdf 100644
--- a/src/d_netfil.c
+++ b/src/d_netfil.c
@@ -62,8 +62,8 @@
 static boolean AddFileToSendQueue(INT32 node, const char *filename, UINT8 fileid);
 
 #ifdef HAVE_CURL
-size_t curlwrite_data(void *ptr, size_t size, size_t nmemb, FILE *stream);
-int curlprogress_callback(void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow);
+static size_t curlwrite_data(void *ptr, size_t size, size_t nmemb, FILE *stream);
+static int curlprogress_callback(void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow);
 #endif
 
 // Sender structure
@@ -1778,21 +1778,34 @@ filestatus_t findfile(char *filename, const UINT8 *wantedmd5sum, boolean complet
 }
 
 #ifdef HAVE_CURL
-size_t curlwrite_data(void *ptr, size_t size, size_t nmemb, FILE *stream)
+static size_t curlwrite_data(void *ptr, size_t size, size_t nmemb, FILE *stream)
 {
     size_t written;
     written = fwrite(ptr, size, nmemb, stream);
     return written;
 }
 
-int curlprogress_callback(void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow)
+static int curlprogress_callback(void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow)
 {
+	time_t curtime;
+
 	(void)clientp;
 	(void)ultotal;
 	(void)ulnow; // Function prototype requires these but we won't use, so just discard
+
+	curtime = time(NULL);
+
 	curl_dlnow = dlnow;
 	curl_dltotal = dltotal;
-	getbytes = curl_dlnow / (time(NULL) - curl_starttime); // To-do: Make this more accurate???
+
+	if (curtime > curl_starttime)
+	{
+		getbytes = curl_dlnow / (curtime - curl_starttime); // To-do: Make this more accurate???
+	}
+	else
+	{
+		getbytes = 0;
+	}
 	return 0;
 }