diff --git a/app/controllers/concerns/uninterlace_png_concern.rb b/app/controllers/concerns/uninterlace_png_concern.rb
index 8e9d06251..0870357c6 100644
--- a/app/controllers/concerns/uninterlace_png_concern.rb
+++ b/app/controllers/concerns/uninterlace_png_concern.rb
@@ -14,6 +14,6 @@ module UninterlacePngConcern
 
   def interlaced?(png_path)
     png = MiniMagick::Image.open(png_path)
-    png.data["interlace"] != "None"
+    png.details["interlace"] != "None"
   end
 end