diff --git a/tests/vm/ubuntu.i386 b/tests/vm/ubuntu.i386
index 7017e6d388..3ea459ee20 100755
--- a/tests/vm/ubuntu.i386
+++ b/tests/vm/ubuntu.i386
@@ -77,6 +77,7 @@ class UbuntuX86VM(basevm.BaseVM):
         time.sleep(5)
         self.wait_ssh()
         # The previous update sometimes doesn't survive a reboot, so do it again
+        self.ssh_root_check("sed -ie s/^#\ deb-src/deb-src/g /etc/apt/sources.list")
         self.ssh_root_check("apt-get update")
         self.ssh_root_check("apt-get build-dep -y qemu")
         self.ssh_root_check("apt-get install -y libfdt-dev flex bison")