diff --git a/pkgs/applications/misc/octoprint/default.nix b/pkgs/applications/misc/octoprint/default.nix
index fa0097272ffb..0488bb7e4b3e 100644
--- a/pkgs/applications/misc/octoprint/default.nix
+++ b/pkgs/applications/misc/octoprint/default.nix
@@ -69,6 +69,7 @@ in pythonPackages.buildPythonApplication rec {
       -e 's,Flask-Assets>=[^"]*,Flask-Assets,g' \
       -e 's,rsa>=[^"]*,rsa,g' \
       -e 's,PyYAML>=[^"]*,PyYAML,g' \
+      -e 's,flask>=[^"]*,flask,g' \
       setup.py
   '';