diff --git a/lib.sh b/lib.sh
index 2cf7d4f7..4a9ccd90 100644
--- a/lib.sh
+++ b/lib.sh
@@ -1061,7 +1061,7 @@ fi
 
 # Check if program is installed (stop_if_installed apache2)
 stop_if_installed() {
-if [ "$(dpkg-query -W -f='${Status}' "${1}" 2>/dev/null | grep -c "ok installed")" == "1" ]
+if [ "$(dpkg-query -W -f='${Status}' "${1}" 2>/dev/null | grep -c "ok installed")" = "1" ]
 then
     print_text_in_color "$IRed" "${1} is installed, it must be a clean server."
     exit 1
diff --git a/nextcloud_install_production.sh b/nextcloud_install_production.sh
index 5cf7a354..60c5af8f 100644
--- a/nextcloud_install_production.sh
+++ b/nextcloud_install_production.sh
@@ -20,7 +20,7 @@ then
 fi
 
 # Install curl if not existing
-if [ "$(dpkg-query -W -f='${Status}' "curl" 2>/dev/null | grep -c "ok installed")" == "1" ]
+if [ "$(dpkg-query -W -f='${Status}' "curl" 2>/dev/null | grep -c "ok installed")" = "1" ]
 then
     echo "curl OK"
 else