diff --git a/Dockerfile b/Dockerfile
index 3fe84d6..d236310 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,7 +16,7 @@ RUN apt-get install -y apt-utils \
                        vim nano git
 
 # Force nokogiri gem not to compile libxml2, it takes too long
-ENV NOKOGIRI_USE_SYSTEM_LIBRARIES 1
+ENV NOKOGIRI_USE_SYSTEM_LIBRARIES=1
 
 # Install thor and rspec globally so we can test the gem without bundle exec
 RUN gem install thor rspec --no-document
@@ -31,3 +31,5 @@ RUN gem build sitediff.gemspec && gem install sitediff --no-document
 
 # Build locally
 RUN bundle install
+
+ENV PATH="/sitediff/bin:${PATH}"