diff --git a/firmware/target/arm/as3525/ascodec-as3525.c b/firmware/target/arm/as3525/ascodec-as3525.c
index 54a579a..0a8b5fe 100644
--- a/firmware/target/arm/as3525/ascodec-as3525.c
+++ b/firmware/target/arm/as3525/ascodec-as3525.c
@@ -284,7 +284,8 @@ void ascodec_init(void)
VIC_INT_ENABLE = INTERRUPT_AUDIO;

/* detect if USB was connected at startup since there is no transition */
- if(ascodec_read(AS3514_IRQ_ENRD0) & USB_STATUS)
+ ascodec_enrd0_shadow = ascodec_read(AS3514_IRQ_ENRD0)
+ if(ascodec_enrd0_shadow & USB_STATUS)
usb_insert_int();
else
usb_remove_int();