diff --git a/src/auracast/multicast_script.py b/src/auracast/multicast_script.py
index dd0ead6..6b1ca16 100644
--- a/src/auracast/multicast_script.py
+++ b/src/auracast/multicast_script.py
@@ -98,11 +98,15 @@ if __name__ == "__main__":
             input_sel, selected_dev = aes67_inputs[0]
             logging.info(f"Selected first AES67 input: index={input_sel}, device={selected_dev['name']}")
     else:
-        if usb_inputs:
-            input_sel, selected_dev = usb_inputs[0]
-            logging.info(f"Selected first USB input: index={input_sel}, device={selected_dev['name']}")
-        else:
-            raise RuntimeError("No USB audio inputs found.")
+        # Loop until a USB input becomes available (mirror AES67 retry behavior)
+        while True:
+            current = list_usb_pw_inputs()
+            if current:
+                input_sel, selected_dev = current[0]
+                logging.info(f"Selected first USB input: index={input_sel}, device={selected_dev['name']}")
+                break
+            logging.info("Waiting for USB input... retrying in 2s")
+            time.sleep(2)
 
     TRANSPORT1 = 'serial:/dev/ttyAMA3,1000000,rtscts' # transport for raspberry pi gpio header
     TRANSPORT2 = 'serial:/dev/ttyAMA4,1000000,rtscts' # transport for raspberry pi gpio header