diff --git a/.gitignore b/.gitignore
index 60c76247c..064597176 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,10 @@ output/output.json
 repo
 tmp/
 
+# Ignore optional native extensions for SSH
+dist/*/build/Release/cpufeatures.node
+dist/*/lib/protocol/crypto/build/Release/sshcrypto.node
+
 # Dependency directory
 node_modules
 
@@ -98,7 +102,3 @@ typings/
 # OS metadata
 .DS_Store
 Thumbs.db
-
-# Ignore built ts files
-__tests__/runner/*
-lib/**/*
diff --git a/script/check-diff b/script/check-diff
index bc45833cd..c68ccf20a 100755
--- a/script/check-diff
+++ b/script/check-diff
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+# Make sure we notice any untracked files generated by the build
+git add --intent-to-add .
 git diff --quiet dist/
 retVal=$?
 if [ $retVal -ne 0 ]; then