diff --git a/bin/stacks b/bin/stacks
index 4a62183..87a844f 100755
--- a/bin/stacks
+++ b/bin/stacks
@@ -474,8 +474,7 @@ Wants=network-online.target
 Type=oneshot
 User=root
 ExecStart=${_self} update run
-Environment=HOME=/root
-Environment=STACKS_DIR=${STACKS_DIR}
+Environment="HOME=/root" "STACKS_DIR=${STACKS_DIR}"
 EOF
       cat > /etc/systemd/system/stacks-update.timer << 'EOF'
 [Unit]
@@ -632,8 +631,7 @@ Wants=network-online.target
 Type=oneshot
 User=root
 ExecStart=${_self} backup run
-Environment=HOME=/root
-Environment=STACKS_DIR=${STACKS_DIR}
+Environment="HOME=/root" "STACKS_DIR=${STACKS_DIR}"
 EOF
       cat > /etc/systemd/system/stacks-backup.timer << 'EOF'
 [Unit]