diff --git a/install_amavis.sh b/install_amavis.sh
index e94c472..e44a48d 100755
--- a/install_amavis.sh
+++ b/install_amavis.sh
@@ -207,15 +207,18 @@ _needed_packages_clamav="clamav \
    clamav-freshclam \
    libgmp-dev \
    libgmp10"
-if [[ "${os_dist,,}" = "debian" ]] && [[ "$os_version" -lt 10 ]] ; then
+if [[ "${os_dist,,}" = "debian" ]] && [[ "$os_version" -eq 10 ]] ; then
 	_needed_packages_clamav="$_needed_packages_clamav \
    libclamunrar7"
-elif [[ "${os_dist,,}" = "debian" ]] && [[ "$os_version" -lt 11 ]] ; then
+elif [[ "${os_dist,,}" = "debian" ]] && [[ "$os_version" -eq 11 ]] ; then
 	_needed_packages_clamav="$_needed_packages_clamav \
    libclamunrar9"
-elif [[ "${os_dist,,}" = "debian" ]] && [[ "$os_version" -lt 12 ]] ; then
+elif [[ "${os_dist,,}" = "debian" ]] && [[ "$os_version" -eq 12 ]] ; then
 	_needed_packages_clamav="$_needed_packages_clamav \
    libclamunrar11"
+elif
+   _needed_packages_clamav="$_needed_packages_clamav \
+   libclamunrar13"
 fi
 
 _needed_decoders_amavis="