diff --git a/debian/resources/php.sh b/debian/resources/php.sh
index b268df9..547f7bc 100755
--- a/debian/resources/php.sh
+++ b/debian/resources/php.sh
@@ -56,16 +56,16 @@ if [ ."$php_version" = ."5.6" ]; then
         apt-get install -y php5 php5-cli php5-fpm php5-pgsql php5-sqlite php5-odbc php5-curl php5-imap php5-gd
 fi
 if [ ."$php_version" = ."7.0" ]; then
-        apt-get install -y php7.0 php7.0-cli php7.0-fpm php7.0-pgsql php7.0-sqlite3 php7.0-odbc php7.0-curl php7.0-imap php7.0-xml php7.0-gd
+        apt-get install -y php7.0 php7.0-cli php7.0-fpm php7.0-pgsql php7.0-sqlite3 php7.0-odbc php7.0-curl php7.0-imap php7.0-xml php7.0-gd php7.0-mbstring
 fi
 if [ ."$php_version" = ."7.1" ]; then
-        apt-get install -y php7.1 php7.1-cli php7.1-fpm php7.1-pgsql php7.1-sqlite3 php7.1-odbc php7.1-curl php7.1-imap php7.1-xml php7.1-gd
+        apt-get install -y php7.1 php7.1-cli php7.1-fpm php7.1-pgsql php7.1-sqlite3 php7.1-odbc php7.1-curl php7.1-imap php7.1-xml php7.1-gd php7.1-mbstring
 fi
 if [ ."$php_version" = ."7.2" ]; then
-        apt-get install -y php7.2 php7.2-cli php7.2-fpm php7.2-pgsql php7.2-sqlite3 php7.2-odbc php7.2-curl php7.2-imap php7.2-xml php7.2-gd
+        apt-get install -y php7.2 php7.2-cli php7.2-fpm php7.2-pgsql php7.2-sqlite3 php7.2-odbc php7.2-curl php7.2-imap php7.2-xml php7.2-gd php7.2-mbstring
 fi
 if [ ."$php_version" = ."7.3" ]; then
-        apt-get install -y php7.3 php7.3-cli php7.3-fpm php7.3-pgsql php7.3-sqlite3 php7.3-odbc php7.3-curl php7.3-imap php7.3-xml php7.3-gd
+        apt-get install -y php7.3 php7.3-cli php7.3-fpm php7.3-pgsql php7.3-sqlite3 php7.3-odbc php7.3-curl php7.3-imap php7.3-xml php7.3-gd php7.3-mbstring
 fi
 
 #update config if source is being used