diff --git a/distros/melodic/overrides.nix b/distros/melodic/overrides.nix
index aef4d0af44..1c59bfc8db 100644
--- a/distros/melodic/overrides.nix
+++ b/distros/melodic/overrides.nix
@@ -64,7 +64,7 @@ rosSelf: rosSuper: with rosSelf.lib; {
     ];
   });
 
-  opencv = opencv3;
+  opencv = self.opencv3;
 
   pcl-ros = rosSuper.pcl-ros.overrideAttrs ({
     patches ? [], ...