diff --git a/Dockerfile b/Dockerfile
index 86bba21..1bdf952 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,5 +12,6 @@ RUN dotnet publish "SteamOpenIdConnectProvider.csproj" -c Release -o /app
 FROM mcr.microsoft.com/dotnet/core/aspnet:3.0 AS base
 WORKDIR /app
 COPY --from=publish /app .
+EXPOSE 80
 HEALTHCHECK CMD curl --fail http://localhost/health || exit 1
 ENTRYPOINT ["dotnet", "SteamOpenIdConnectProvider.dll"]