diff --git a/tools/idem_apt_install b/tools/idem_apt_install
index ac77959..de755b3 100755
--- a/tools/idem_apt_install
+++ b/tools/idem_apt_install
@@ -39,7 +39,7 @@ debian)
 arch)
     for i in "$@"; do
         if ! pacman -Ql "$i" 2>/dev/null | grep -q ^ii; then
-            sudo pacman -S "$i"
+            sudo pacman -Sy "$i"
         elif [ -n "${VERBOSE+x}" ] && $VERBOSE; then
             echo "pacman package <$i> already installed!"
         fi