diff --git a/tests/vm/ubuntu.i386 b/tests/vm/ubuntu.i386
index fc319e0e6eb56b9b2b75ab133470eaac5602056a..fc27b6935e7a1168605c88f91916e33a82dd5a64 100755
--- a/tests/vm/ubuntu.i386
+++ b/tests/vm/ubuntu.i386
@@ -77,7 +77,7 @@ class UbuntuX86VM(basevm.BaseVM):
         # The previous update sometimes doesn't survive a reboot, so do it again
         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")
+        self.ssh_root_check("apt-get install -y libfdt-dev flex bison")
         self.ssh_root("poweroff")
         self.wait()
         if os.path.exists(img):