diff --git a/homeassistant/components/proxy/camera.py b/homeassistant/components/proxy/camera.py
index 754f09fa199..c3f7151431a 100644
--- a/homeassistant/components/proxy/camera.py
+++ b/homeassistant/components/proxy/camera.py
@@ -77,6 +77,8 @@ def _precheck_image(image, opts):
     if imgfmt not in ("PNG", "JPEG"):
         _LOGGER.warning("Image is of unsupported type: %s", imgfmt)
         raise ValueError()
+    if not img.mode == "RGB":
+        img = img.convert("RGB")
     return img