diff --git a/src/common/prod/iam.tf b/src/common/prod/iam.tf
index 9ba0d3a6e..47da6cef7 100644
--- a/src/common/prod/iam.tf
+++ b/src/common/prod/iam.tf
@@ -21,7 +21,7 @@ data "azuread_service_principal" "apim_client_svc" {
 
 resource "azurerm_role_assignment" "apim_client_role" {
   for_each             = toset(local.role_definition_names.apim_client)
-  principal_id         = data.azuread_service_principal.apim_client_svc.id
+  principal_id         = data.azuread_service_principal.apim_client_svc.object_id
   role_definition_name = each.value
   scope                = module.apim_itn.id
 }
@@ -34,7 +34,7 @@ data "azuread_service_principal" "dev_portal_svc" {
 
 resource "azurerm_role_assignment" "dev_portal_role" {
   for_each             = toset(local.role_definition_names.dev_portal)
-  principal_id         = data.azuread_service_principal.dev_portal_svc.id
+  principal_id         = data.azuread_service_principal.dev_portal_svc.object_id
   role_definition_name = each.value
   scope                = module.apim_itn.id
 }