diff --git a/src/libtracker-data/tracker-data-manager.c b/src/libtracker-data/tracker-data-manager.c
index 14ca1a71ab8d6729c33b3b03088d35bfc129601a..dad0fa3238d1e1823cc34150604218ba1a23d58a 100644
--- a/src/libtracker-data/tracker-data-manager.c
+++ b/src/libtracker-data/tracker-data-manager.c
@@ -1963,7 +1963,7 @@ check_properties_completeness (TrackerOntologies  *ontologies,
 
 			g_set_error (error,
 			             TRACKER_SPARQL_ERROR,
-				     TRACKER_SPARQL_ERROR_OPEN_ERROR,
+			             TRACKER_SPARQL_ERROR_INCOMPLETE_PROPERTY_DEFINITION,
 			             "%s: Property %s has no defined %s.",
 			             definition_location, property_name, missing_definition);
 
@@ -2121,7 +2121,7 @@ get_ontology_from_file (TrackerDataManager *manager,
 	if (ret == NULL) {
 		g_set_error (error,
 		             TRACKER_SPARQL_ERROR,
-			     TRACKER_SPARQL_ERROR_OPEN_ERROR,
+		             TRACKER_SPARQL_ERROR_MISSING_LAST_MODIFIED_HEADER,
 		             "%s: Ontology has no nrl:lastModified header", ontology_uri);
 		goto out;
 	}
diff --git a/src/libtracker-sparql/tracker-error.c b/src/libtracker-sparql/tracker-error.c
index 730655968a461d153e77da74bd2a2c34c3ec6ffd..8be2effc2e1a07fb3ffde151d20f269d97b01583 100644
--- a/src/libtracker-sparql/tracker-error.c
+++ b/src/libtracker-sparql/tracker-error.c
@@ -35,6 +35,8 @@ static const GDBusErrorEntry tracker_sparql_error_entries[] =
 	{TRACKER_SPARQL_ERROR_UNKNOWN_GRAPH, "org.freedesktop.Tracker.Error.UnknownGraph"},
 	{TRACKER_SPARQL_ERROR_UNKNOWN_PROPERTY, "org.freedesktop.Tracker.Error.UnknownProperty"},
 	{TRACKER_SPARQL_ERROR_UNSUPPORTED, "org.freedesktop.Tracker.Error.Unsupported"},
+	{TRACKER_SPARQL_ERROR_MISSING_LAST_MODIFIED_HEADER, "org.freedesktop.Tracker.Error.MissingLastModifiedHeader"},
+	{TRACKER_SPARQL_ERROR_INCOMPLETE_PROPERTY_DEFINITION, "org.freedesktop.Tracker.Error.IncompleteProperty"},
 };
 
 G_STATIC_ASSERT (G_N_ELEMENTS (tracker_sparql_error_entries) == TRACKER_SPARQL_N_ERRORS);
diff --git a/src/libtracker-sparql/tracker-error.h b/src/libtracker-sparql/tracker-error.h
index 68c48d094bb5d02c78bfc0d51a6f0de93ce86983..e56cfb2c15cc09310f784efcd2a66268767e569c 100644
--- a/src/libtracker-sparql/tracker-error.h
+++ b/src/libtracker-sparql/tracker-error.h
@@ -50,6 +50,8 @@ G_BEGIN_DECLS
  * @TRACKER_SPARQL_ERROR_UNKNOWN_GRAPH: Unknown graph.
  * @TRACKER_SPARQL_ERROR_UNKNOWN_PROPERTY: Unknown property.
  * @TRACKER_SPARQL_ERROR_UNSUPPORTED: Unsupported feature or method.
+ * @TRACKER_SPARQL_ERROR_MISSING_LAST_MODIFIED_HEADER: The ontology doesn't contain nrl:lastModified header
+ * @TRACKER_SPARQL_ERROR_INCOMPLETE_PROPERTY_DEFINITION: The property is not completely defined.
  * @TRACKER_SPARQL_N_ERRORS: The total number of error codes.
  *
  * Error domain for Tracker Sparql. Errors in this domain will be from the
@@ -69,6 +71,8 @@ typedef enum {
 	TRACKER_SPARQL_ERROR_UNKNOWN_GRAPH,
 	TRACKER_SPARQL_ERROR_UNKNOWN_PROPERTY,
 	TRACKER_SPARQL_ERROR_UNSUPPORTED,
+	TRACKER_SPARQL_ERROR_MISSING_LAST_MODIFIED_HEADER,
+	TRACKER_SPARQL_ERROR_INCOMPLETE_PROPERTY_DEFINITION,
 	TRACKER_SPARQL_N_ERRORS,
 } TrackerSparqlError;