diff --git a/ext/swiftlint/Rakefile b/ext/swiftlint/Rakefile
index 779ed33..1dd85c0 100644
--- a/ext/swiftlint/Rakefile
+++ b/ext/swiftlint/Rakefile
@@ -16,7 +16,7 @@ namespace :swiftlint do
     SWIFTLINT_MD5_HASH = DangerSwiftlint::SWIFTLINT_HASH
 
     puts "Downloading swiftlint@#{VERSION}"
-    sh "sh #{SCRIPT_PATH}/downloadSwiftlint.sh -u #{URL} -d #{DESTINATION} -a #{ASSET} -dh #{SWIFTLINT_MD5_HASH}"
+    sh "#{SCRIPT_PATH}/downloadSwiftlint.sh -u #{URL} -d #{DESTINATION} -a #{ASSET} -dh #{SWIFTLINT_MD5_HASH}"
   end
 end
 
diff --git a/ext/swiftlint/downloadSwiftlint.sh b/ext/swiftlint/downloadSwiftlint.sh
index 1d6323d..19b29c1 100755
--- a/ext/swiftlint/downloadSwiftlint.sh
+++ b/ext/swiftlint/downloadSwiftlint.sh
@@ -34,7 +34,16 @@ done
 ### Download
 mkdir -p "${destination}"
 curl -s -L "${url}" -o "${asset}"
-if [[ ! -z "${SWIFTLINT_VERSION}" || $(md5 -q "${asset}") == "${default_hash}" ]]; then
+
+# If macOS
+if [[ "$OSTYPE" == "darwin"* ]]; then
+   resulting_hash=`md5 -q ${asset}`
+# Default to linux
+else
+   resulting_hash=`md5sum ${asset} | awk '{ print $1 }'`
+fi
+
+if [[ ! -z "${SWIFTLINT_VERSION}" || "$resulting_hash" == "${default_hash}" ]]; then
   # if another version is set || our hardcoded hash is correct
   unzip -o -q "${asset}" -d "${destination}"
 else
diff --git a/spec/danger_plugin_spec.rb b/spec/danger_plugin_spec.rb
index af8927c..75ad33b 100755
--- a/spec/danger_plugin_spec.rb
+++ b/spec/danger_plugin_spec.rb
@@ -220,6 +220,7 @@ module Danger
         end
 
         it 'crashes if renamed_files is not configured properly' do
+          allow_any_instance_of(Swiftlint).to receive(:lint).and_return('')
           allow(@swiftlint.git).to receive(:modified_files).and_return([
                                                                          'spec/fixtures/SwiftFileThatWasRenamedToSomethingElse.swift'
                                                                        ])
@@ -227,6 +228,7 @@ module Danger
         end
 
         it 'does not crash if a modified file was renamed' do
+          allow_any_instance_of(Swiftlint).to receive(:lint).and_return('')
           allow(@swiftlint.git).to receive(:modified_files).and_return([
                                                                          'spec/fixtures/SwiftFileThatWasRenamedToSomethingElse.swift'
                                                                        ])