diff --git a/main.c b/main.c
--- a/main.c
+++ b/main.c
@@ -327,7 +327,7 @@ void process()
         tempstr[numlen] = '\r';
         tempstr[numlen+1] = '\n';
 
-        while(CDC_Transmit_FS(tempstr, numlen+2) == USBD_BUSY);
+        CDC_Transmit_FS(tempstr, numlen+2);
        // while(CDC_Transmit_FS("\r\n", 2) == USBD_BUSY);
 
         last_vcp_tx = ticks;