diff --git a/db_related/serber_sql.sql b/db_related/serber_sql.sql
index bc4e1e9..45cf77f 100644
--- a/db_related/serber_sql.sql
+++ b/db_related/serber_sql.sql
@@ -59,7 +59,7 @@ CREATE TABLE arrival(time_of_day TIME,
                      week_day INTEGER,
                      tram_line INTEGER,
                      direction BOOLEAN
-                     PRIMARY KEY (week_day,tram_line)
+                     PRIMARY KEY(week_day,tram_line)
                      CONSTRAINT in_week CHECK (week_day >= 0 AND week_day <= 6)
                      CONSTRAINT valid_line CHECK (tram_line >= 1 AND tram_line <= 4)
                      );