diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index 0880079189..775ca20e45 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -56,13 +56,21 @@ def adapt_datetime_with_timezone_support(value):
         value = value.astimezone(timezone.utc).replace(tzinfo=None)
     return value.isoformat(str(" "))
 
-Database.register_converter(str("bool"), lambda s: str(s) == '1')
-Database.register_converter(str("time"), parse_time)
-Database.register_converter(str("date"), parse_date)
-Database.register_converter(str("datetime"), parse_datetime_with_timezone_support)
-Database.register_converter(str("timestamp"), parse_datetime_with_timezone_support)
-Database.register_converter(str("TIMESTAMP"), parse_datetime_with_timezone_support)
-Database.register_converter(str("decimal"), util.typecast_decimal)
+def decoder(conv_func):
+    """ The Python sqlite3 interface returns always byte strings.
+        This function converts the received value to a regular string before
+        passing it to the receiver function.
+    """
+    return lambda s: conv_func(s.decode('utf-8'))
+
+Database.register_converter(str("bool"), decoder(lambda s: s == '1'))
+Database.register_converter(str("time"), decoder(parse_time))
+Database.register_converter(str("date"), decoder(parse_date))
+Database.register_converter(str("datetime"), decoder(parse_datetime_with_timezone_support))
+Database.register_converter(str("timestamp"), decoder(parse_datetime_with_timezone_support))
+Database.register_converter(str("TIMESTAMP"), decoder(parse_datetime_with_timezone_support))
+Database.register_converter(str("decimal"), decoder(util.typecast_decimal))
+
 Database.register_adapter(datetime.datetime, adapt_datetime_with_timezone_support)
 Database.register_adapter(decimal.Decimal, util.rev_typecast_decimal)
 if Database.version_info >= (2, 4, 1):