diff --git a/.gitmodules b/.gitmodules
index d3d6c84..e95a192 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,15 +1,15 @@
 [submodule "prebuilts"]
 	path = prebuilts
-	url = sso://hafnium/hafnium/prebuilts
+	url = https://hafnium.googlesource.com/hafnium/prebuilts
 	shallow = true
 [submodule "driver/linux"]
 	path = driver/linux
-	url = sso://hafnium/hafnium/driver/linux
+	url = https://hafnium.googlesource.com/hafnium/driver/linux
 [submodule "project/reference"]
 	path = project/reference
-	url = sso://hafnium/hafnium/project/reference
+	url = https://hafnium.googlesource.com/hafnium/project/reference
 	shallow = true
 [submodule "third_party/googletest"]
 	path = third_party/googletest
-	url = sso://hafnium/hafnium/third_party/googletest
+	url = https://hafnium.googlesource.com/hafnium/third_party/googletest
 	shallow = true
diff --git a/docs/GettingStarted.md b/docs/GettingStarted.md
index 9a815a6..f61c4f6 100644
--- a/docs/GettingStarted.md
+++ b/docs/GettingStarted.md
@@ -10,7 +10,7 @@
 ## Getting the source code
 
 ``` shell
-git clone --recurse-submodules sso://hafnium/hafnium && (cd hafnium && f=`git rev-parse --git-dir`/hooks/commit-msg ; curl -Lo $f https://gerrit-review.googlesource.com/tools/hooks/commit-msg ; chmod +x $f)
+git clone --recurse-submodules https://hafnium.googlesource.com/hafnium && (cd hafnium && f=`git rev-parse --git-dir`/hooks/commit-msg ; curl -Lo $f https://gerrit-review.googlesource.com/tools/hooks/commit-msg ; chmod +x $f)
 ```
 
 To upload a commit for review:
diff --git a/kokoro/ubuntu/build.sh b/kokoro/ubuntu/build.sh
index 769ce46..faa0e22 100755
--- a/kokoro/ubuntu/build.sh
+++ b/kokoro/ubuntu/build.sh
@@ -29,6 +29,11 @@
 then
 	# Server
 	cd git/hafnium
+
+	# Initialize submodules manually as https:// isn't supported by the
+	# initial checkout.
+	git submodule init
+	git submodule update
 else
 	# Local
 	echo "Testing kokoro build locally..."