diff --git a/configs/diasom_rk35xx_evb_defconfig b/configs/diasom_rk35xx_evb_defconfig
index 34f44b9cdaf2..3db8addb0d74 100644
--- a/configs/diasom_rk35xx_evb_defconfig
+++ b/configs/diasom_rk35xx_evb_defconfig
@@ -10,7 +10,7 @@ BR2_GDB_VERSION_15=y
 BR2_WGET="wget --passive-ftp -nd -t 3"
 BR2_SVN="svn"
 BR2_DL_DIR="$(TOPDIR)/../output/download"
-BR2_BACKUP_SITE="http://sources.buildroot.net"
+BR2_BACKUP_SITE="https://sources.buildroot.net"
 BR2_KERNEL_MIRROR="https://www.kernel.org/pub"
 BR2_GNU_MIRROR="http://ftp.gnu.org/pub/gnu"
 BR2_CPAN_MIRROR="http://cpan.metacpan.org"