diff --git a/core/Application.php b/core/Application.php
index 659a2c5d3d..cc4d9ba990 100644
--- a/core/Application.php
+++ b/core/Application.php
@@ -153,6 +153,13 @@ class Application extends App {
 						$subject->addHintForMissingSubject($table->getName(), 'calendarobject_calid_index');
 					}
 				}
+
+				if ($schema->hasTable('schedulingobjects')) {
+					$table = $schema->getTable('schedulingobjects');
+					if (!$table->hasIndex('schedulobj_principuri_index')) {
+						$subject->addHintForMissingSubject($table->getName(), 'schedulobj_principuri_index');
+					}
+				}
 			}
 		);
 
diff --git a/core/Command/Db/AddMissingIndices.php b/core/Command/Db/AddMissingIndices.php
index 02c8999210..527a2cd7b1 100644
--- a/core/Command/Db/AddMissingIndices.php
+++ b/core/Command/Db/AddMissingIndices.php
@@ -234,6 +234,19 @@ class AddMissingIndices extends Command {
 			}
 		}
 
+		$output->writeln('<info>Check indices of the schedulingobjects table.</info>');
+		if ($schema->hasTable('schedulingobjects')) {
+			$table = $schema->getTable('schedulingobjects');
+			if (!$table->hasIndex('schedulobj_principuri_index')) {
+				$output->writeln('<info>Adding schedulobj_principuri_index index to the schedulingobjects table, this can take some time...</info>');
+
+				$table->addIndex(['principaluri'], 'schedulobj_principuri_index');
+				$this->connection->migrateToSchema($schema->getWrappedSchema());
+				$updated = true;
+				$output->writeln('<info>schedulingobjects table updated successfully.</info>');
+			}
+		}
+
 		if (!$updated) {
 			$output->writeln('<info>Done.</info>');
 		}