diff --git a/picamera/mmalobj.py b/picamera/mmalobj.py
index ec167f2f..1dd1476d 100644
--- a/picamera/mmalobj.py
+++ b/picamera/mmalobj.py
@@ -2619,7 +2619,7 @@ class MMALVideoDecoder(MMALDecoder):
 
 class MMALImageDecoder(MMALDecoder):
     """
-    Represents the MMAL iamge decoder component. This component has 1 input
+    Represents the MMAL image decoder component. This component has 1 input
     port and 1 output port. The input port is usually configured with
     ``MMAL_ENCODING_JPEG``.
     """