diff --git a/buildconf/raspberrypi3-64/local.conf.sample b/buildconf/raspberrypi3-64/local.conf.sample
index f125771..377dd45 100644
--- a/buildconf/raspberrypi3-64/local.conf.sample
+++ b/buildconf/raspberrypi3-64/local.conf.sample
@@ -31,6 +31,8 @@ ENABLE_UART = "1"
 ENABLE_SPI_BUS = "1"
 ENABLE_I2C = "1"
 
+RPI_USE_U_BOOT = "1"
+
 INHERIT += "rm_work"
 
 INHERIT += "own-mirrors"
diff --git a/buildconf/raspberrypi4-64/local.conf.sample b/buildconf/raspberrypi4-64/local.conf.sample
index f125771..377dd45 100644
--- a/buildconf/raspberrypi4-64/local.conf.sample
+++ b/buildconf/raspberrypi4-64/local.conf.sample
@@ -31,6 +31,8 @@ ENABLE_UART = "1"
 ENABLE_SPI_BUS = "1"
 ENABLE_I2C = "1"
 
+RPI_USE_U_BOOT = "1"
+
 INHERIT += "rm_work"
 
 INHERIT += "own-mirrors"