diff --git a/db_compare.py b/db_compare.py
index 728a38d5..a3ba908c 100755
--- a/db_compare.py
+++ b/db_compare.py
@@ -332,7 +332,9 @@ def check_problem_common():
 		check_same(o,n, old_fields, new_fields)
 
 	# Opravovatelé
-	old_query = "SELECT id, opravovatel_id FROM seminar_problemy"
+	# Po staru byli opravovatele organizatori, takze je potreba je dohledat.
+	old_query = """SELECT seminar_problemy.id, org.id AS opravovatel_id FROM seminar_problemy
+		JOIN seminar_organizator AS org ON seminar_problemy.opravovatel_id = org.user_id;"""
 	new_query = "SELECT problem_id, organizator_id FROM seminar_problemy_opravovatele"
 
 	# Simple cursors