diff --git a/build.sh b/build.sh
index 135da35..ea96633 100755
--- a/build.sh
+++ b/build.sh
@@ -21,7 +21,7 @@ EOF
 			PACKAGES="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < "${i}-packages-nr")"
 			if [ -n "$PACKAGES" ]; then
 				on_chroot << EOF
-apt-get -o APT::Acquire::Retries=3 install --no-install-recommends -y $PACKAGES
+apt-get -o Acquire::Retries=3 install --no-install-recommends -y $PACKAGES
 EOF
 				if [ "${USE_QCOW2}" = "1" ]; then
 					on_chroot << EOF
@@ -36,7 +36,7 @@ EOF
 			PACKAGES="$(sed -f "${SCRIPT_DIR}/remove-comments.sed" < "${i}-packages")"
 			if [ -n "$PACKAGES" ]; then
 				on_chroot << EOF
-apt-get -o APT::Acquire::Retries=3 install -y $PACKAGES
+apt-get -o Acquire::Retries=3 install -y $PACKAGES
 EOF
 				if [ "${USE_QCOW2}" = "1" ]; then
 					on_chroot << EOF