diff --git a/src/seabreeze/pyseabreeze/devices.py b/src/seabreeze/pyseabreeze/devices.py
index 3b419e5c..ddc918db 100644
--- a/src/seabreeze/pyseabreeze/devices.py
+++ b/src/seabreeze/pyseabreeze/devices.py
@@ -382,7 +382,7 @@ def get_serial_number(self):
                 return self.f.eeprom.eeprom_read_slot(0)
 
             elif isinstance(protocol, OBPProtocol):
-                serial_len = ord(protocol.query(0x00000101))
+                serial_len = ord(protocol.query(0x00000101, timeout_ms=10_000))
                 return protocol.query(0x00000100)[:serial_len].decode("utf8")
 
             else: