diff --git a/zabbix-agent-scripts/get_nc_quota_metrics.py b/zabbix-agent-scripts/get_nc_quota_metrics.py
index 78f7fe5..ed06bb5 100644
--- a/zabbix-agent-scripts/get_nc_quota_metrics.py
+++ b/zabbix-agent-scripts/get_nc_quota_metrics.py
@@ -32,7 +32,7 @@
 ## as the JSON file created is not correctly formatted as a JSON
 ## file.
 result_set = subprocess.check_output(
-                                     ["/usr/bin/php", "/var/www/nextcloud/occ", "usage-report:generate"]
+                                     ["sudo", "-u", "www-data", "/usr/bin/php", "/var/www/nextcloud/occ", "usage-report:generate"]
                                     )
 
 result_set = result_set.decode()
@@ -48,7 +48,16 @@
                 )
 
 ## In some cases assigned_quota get the value of -2 or 'none'. In these cases, we are replacing with 0
-df["assigned_quota"] = pd.to_numeric(df.assigned_quota.str.replace('none','0').str.replace('-2','0'))
+df["assigned_quota"] = df.assigned_quota.str.replace('none','0').str.replace('-2','0')
+
+# See https://github.com/nextcloud/user_usage_report/issues/200
+def trf_to_nr(elem):
+	if 'GB' in elem:
+		return int(elem.split()[0])*1024*1024*1024
+	else:
+		return int(elem)
+
+df["assigned_quota"] = df.assigned_quota.apply(trf_to_nr)
 
 ## Transformation to int is necessary as json library cannot serialize numpy
 ## data types