diff --git a/environments/dotnet20/build.sh b/environments/dotnet20/build.sh
old mode 100644
new mode 100755
index fb3b9549..9879e39e
--- a/environments/dotnet20/build.sh
+++ b/environments/dotnet20/build.sh
@@ -1,3 +1,4 @@
+#!/bin/sh
 dotnet restore
 dotnet publish -c Release -o out
 docker build -t fission/dotnet20-env .