diff --git a/src/preprocess.py b/src/preprocess.py
index 91d71ef..f09e25e 100644
--- a/src/preprocess.py
+++ b/src/preprocess.py
@@ -79,7 +79,7 @@ class DbOp(object):
                 with conn.cursor() as cur:
                     cur.execute("""
                         insert into measurement_t (time, application, variable, value, unit) 
-                            values (now(), %(application)s, %(variable)s, %(value)s, %(unit)s
+                            values (now(), %(application)s, %(variable)s, %(value)s, %(unit)s)
                         """,
                         { 
                             'application': measurement['application'],