diff --git a/pkgs/by-name/op/open-webui/package.nix b/pkgs/by-name/op/open-webui/package.nix
index ba449c3bb7dd..3523f578d8d1 100644
--- a/pkgs/by-name/op/open-webui/package.nix
+++ b/pkgs/by-name/op/open-webui/package.nix
@@ -81,6 +81,7 @@ python312.pkgs.buildPythonApplication rec {
     docx2txt
     duckduckgo-search
     einops
+    emoji # This dependency is missing in upstream's pyproject.toml
     extract-msg
     fake-useragent
     fastapi