diff --git a/src/coldfront_plugin_cloud/management/commands/calculate_storage_gb_hours.py b/src/coldfront_plugin_cloud/management/commands/calculate_storage_gb_hours.py
index dc3edfb..b1bad40 100644
--- a/src/coldfront_plugin_cloud/management/commands/calculate_storage_gb_hours.py
+++ b/src/coldfront_plugin_cloud/management/commands/calculate_storage_gb_hours.py
@@ -154,7 +154,7 @@ def process_invoice_row(allocation, attrs, su_name, rate):
                     InvoiceMonth=options['invoice_month'],
                     Project_Name=allocation.get_attribute(attributes.ALLOCATION_PROJECT_NAME),
                     Project_ID=allocation.get_attribute(attributes.ALLOCATION_PROJECT_ID),
-                    PI=allocation.project.pi,
+                    PI=allocation.project.pi.email,
                     Institution_Specific_Code=allocation.get_attribute(
                         attributes.ALLOCATION_INSTITUTION_SPECIFIC_CODE
                     ) or "N/A",