diff --git a/proxy/deploy.go b/proxy/deploy.go
index 2fa5ac37d..240c98605 100644
--- a/proxy/deploy.go
+++ b/proxy/deploy.go
@@ -28,7 +28,7 @@ func DeployFunction(fprocess string, gateway string, functionName string, image
 	} else if language == "ruby" {
 		fprocessTemplate = "ruby index.rb"
 	} else if language == "csharp" {
-		fprocessTemplate = "dotnet ./bin/Debug/netcoreapp2.0/root.dll"
+		fprocessTemplate = "dotnet ./root.dll"
 	}
 
 	gateway = strings.TrimRight(gateway, "/")
diff --git a/template/csharp/Dockerfile b/template/csharp/Dockerfile
index cc6cb70f8..cf76c6f3e 100644
--- a/template/csharp/Dockerfile
+++ b/template/csharp/Dockerfile
@@ -1,4 +1,14 @@
-FROM microsoft/dotnet:2.0-sdk
+FROM microsoft/dotnet:2.0-sdk as builder
+
+ENV DOTNET_CLI_TELEMETRY_OPTOUT 1
+
+WORKDIR /root/
+WORKDIR /root/src
+COPY .  .
+RUN dotnet restore ./root.csproj
+RUN dotnet publish -c release -o published
+
+FROM microsoft/dotnet:2.0-runtime
 
 #ADD https://github.com/alexellis/faas/releases/download/0.6.1/fwatchdog /usr/bin
 RUN apt-get update -qy \
@@ -10,14 +20,10 @@ RUN apt-get update -qy \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
-ENV DOTNET_CLI_TELEMETRY_OPTOUT 1
-
 WORKDIR /root/
-WORKDIR /root/src
-COPY .  .
-RUN dotnet restore ./root.csproj
-RUN dotnet build
+COPY --from=builder /root/src/published .
 
-ENV fprocess="dotnet ./bin/Debug/netcoreapp2.0/root.dll"
+ENV fprocess="dotnet ./root.dll"
 EXPOSE 8080
 CMD ["fwatchdog"]
+