diff --git a/scripts/_common.sh b/scripts/_common.sh
index 7f031f3..2b61c4d 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -109,7 +109,7 @@ ynh_install_php7 () {
   echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php7.list
 
   ynh_package_update
-  ynh_install_app_dependencies php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl
+  ynh_install_app_dependencies php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl php7.1-bcmath
   sudo update-alternatives --install /usr/bin/php php /usr/bin/php5 70
 }
 
@@ -117,5 +117,5 @@ ynh_remove_php7 () {
   sudo rm -f /etc/apt/sources.list.d/php7.list
   sudo apt-key del 4096R/89DF5277
   sudo apt-key del 2048R/11A06851
-  ynh_remove_app_dependencies php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl
+  ynh_remove_app_dependencies php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl php7.1-bcmath
 }
diff --git a/scripts/restore b/scripts/restore
index 71d90cb..2432870 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -77,7 +77,7 @@ ynh_system_user_create $app
 #=================================================
 
 ynh_install_php7
-ynh_install_app_dependencies php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl
+ynh_install_app_dependencies php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl php7.1-bcmath
 
 ynh_install_nodejs 6.10.3
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 47ce4c0..a2b262c 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -84,7 +84,7 @@ ynh_system_user_create $app
 #=================================================
 
 # install new dependencies
-ynh_install_app_dependencies php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl
+ynh_install_app_dependencies php7.1 php7.1-zip php7.1-fpm php7.1-mysql php7.1-xml php7.1-intl php7.1-mbstring php7.1-gd php7.1-curl php7.1-bcmath
 
 #=================================================
 # PHP-FPM 7.1 CONFIGURATION