diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f0fd99d1774..df15a5c207d 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -10200,7 +10200,7 @@ in {
     };
 
     patchPhase = ''
-      substituteInPlace dialog.py ":/bin:/usr/bin" ":$out/bin"
+      substituteInPlace dialog.py --replace ":/bin:/usr/bin" ":$out/bin"
     '';
 
     meta = with stdenv.lib; {