diff --git a/setup_board b/setup_board
index 725901954f..c1708639fa 100755
--- a/setup_board
+++ b/setup_board
@@ -320,3 +320,6 @@ fi
 
 # Setup BOARD_ROOT for QEMU user emulation.
 setup_qemu_static "${BOARD_ROOT}"
+
+# Build grub platform modules if needed.
+sudo -E emerge --changed-use sys-boot/grub