diff --git a/package.yaml b/package.yaml
index 1239077..5c594be 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,4 +1,4 @@
-name: certificate_roots
+name: certificate-roots
 description: The root certificates needed to connect to HTTPS servers on the public web.
 license: MPL-2.0
 environment:
diff --git a/src/certificate_roots.toit b/src/certificate-roots.toit
similarity index 100%
rename from src/certificate_roots.toit
rename to src/certificate-roots.toit
diff --git a/src/get_root.toit b/src/get-root.toit
similarity index 100%
rename from src/get_root.toit
rename to src/get-root.toit
diff --git a/tools/fetch.sh b/tools/fetch.sh
index 4816ed1..4fdf11a 100755
--- a/tools/fetch.sh
+++ b/tools/fetch.sh
@@ -19,4 +19,4 @@ git clone https://github.com/agl/extract-nss-root-certs.git
 curl https://hg.mozilla.org/mozilla-central/raw-file/tip/security/nss/lib/ckfw/builtins/certdata.txt -o certdata.txt
 go run extract-nss-root-certs/convert_mozilla_certdata.go > certdata.new
 
-toit.run to_toit_source.toit certdata.new > ../src/certificate_roots.toit
+toit.run to_toit_source.toit certdata.new > ../src/certificate-roots.toit