diff --git a/script/bootstrap b/script/bootstrap
index b1af61bb1..dc3868a3b 100755
--- a/script/bootstrap
+++ b/script/bootstrap
@@ -49,7 +49,7 @@ install_packages_apt()
         sudo apt-get -y install binutils-arm-none-eabi gcc-arm-none-eabi gdb-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib || die
     else
         # add gcc-arm-embedded ppa
-        sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa || die
+        sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa -y || die
         sudo apt-get update || die
         sudo apt-get -y install gcc-arm-embedded || die
     fi