diff --git a/picamera/color.py b/picamera/color.py
index 9c46444b..67b606d2 100644
--- a/picamera/color.py
+++ b/picamera/color.py
@@ -28,6 +28,7 @@
 # POSSIBILITY OF SUCH DAMAGE.
 
 import colorzero as c0
+import warnings
 
 from .exc import PiCameraDeprecated