diff --git a/helpers/ruby b/helpers/ruby
index 982d0b266..e0e388e22 100644
--- a/helpers/ruby
+++ b/helpers/ruby
@@ -216,7 +216,7 @@ ynh_install_ruby () {
         final_ruby_version=$ruby_version
     fi
     ynh_print_info --message="Installing Ruby-$final_ruby_version"
-    CONFIGURE_OPTS="--disable-install-doc --with-jemalloc" MAKE_OPTS="-j2" rbenv install --skip-existing $final_ruby_version > /dev/null 2>&1
+    RUBY_CONFIGURE_OPTS="--disable-install-doc --with-jemalloc" MAKE_OPTS="-j2" rbenv install --skip-existing $final_ruby_version > /dev/null 2>&1
 
     # Store ruby_version into the config of this app
     ynh_app_setting_set --app=$YNH_APP_INSTANCE_NAME --key=ruby_version --value=$final_ruby_version