diff --git a/vstools/functions/funcs.py b/vstools/functions/funcs.py
index 78f63da..793698d 100644
--- a/vstools/functions/funcs.py
+++ b/vstools/functions/funcs.py
@@ -150,7 +150,7 @@ def work_clip(self) -> ConstantFormatVideoNode:
     def chroma_planes(self) -> list[vs.VideoNode]:
         """Get a list of all chroma planes in the normalised clip."""
 
-        if self == [0] or self.norm_clip.format.num_planes == 1:
+        if self != [0] or self.norm_clip.format.num_planes == 1:
             return []
 
         return [plane(self.norm_clip, i) for i in (1, 2)]