diff --git a/adafruit_bus_device/i2c_device.py b/adafruit_bus_device/i2c_device.py
index fc538a7..5e18849 100644
--- a/adafruit_bus_device/i2c_device.py
+++ b/adafruit_bus_device/i2c_device.py
@@ -11,10 +11,12 @@
     from typing import Optional, Type
     from types import TracebackType
     from circuitpython_typing import ReadableBuffer, WriteableBuffer
+
+    # Used only for type annotations.
+    from busio import I2C
 except ImportError:
     pass
 
-from busio import I2C
 
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_BusDevice.git"
diff --git a/adafruit_bus_device/spi_device.py b/adafruit_bus_device/spi_device.py
index 0460a75..f4b825a 100644
--- a/adafruit_bus_device/spi_device.py
+++ b/adafruit_bus_device/spi_device.py
@@ -12,11 +12,13 @@
 try:
     from typing import Optional, Type
     from types import TracebackType
+
+    # Used only for type annotations.
+    from busio import SPI
+    from digitalio import DigitalInOut
 except ImportError:
     pass
 
-from busio import SPI
-from digitalio import DigitalInOut
 
 __version__ = "0.0.0-auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_BusDevice.git"