diff --git a/config/config_test.go b/config/config_test.go
index 5dd1d6f38..0a70f3934 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -123,7 +123,7 @@ func TestDefaults(t *testing.T) {
 	eCfg.SMRater = "127.0.0.1:2012"
 	eCfg.SMRaterReconnects = 3
 	eCfg.SMDebitInterval = 10
-	eCfg.SMMaxCallDuration = time.Time(3) * time.Hour
+	eCfg.SMMaxCallDuration = time.Duration(3) * time.Hour
 	eCfg.FreeswitchServer = "127.0.0.1:8021"
 	eCfg.FreeswitchPass = "ClueCon"
 	eCfg.FreeswitchReconnects = 5
@@ -246,7 +246,7 @@ func TestConfigFromFile(t *testing.T) {
 	eCfg.SMRater = "test"
 	eCfg.SMRaterReconnects = 99
 	eCfg.SMDebitInterval = 99
-	eCfg.SMMaxCallDuration = "test"
+	eCfg.SMMaxCallDuration = time.Duration(99)*time.Second
 	eCfg.FreeswitchServer = "test"
 	eCfg.FreeswitchPass = "test"
 	eCfg.FreeswitchReconnects = 99
diff --git a/config/test_data.txt b/config/test_data.txt
index f3372761a..0b820a81c 100644
--- a/config/test_data.txt
+++ b/config/test_data.txt
@@ -96,7 +96,7 @@ switch_type = test			# Defines the type of switch behind: <freeswitch>.
 rater = test			# Address where to reach the Rater.
 rater_reconnects = 99			# Number of reconnects to rater before giving up.
 debit_interval = 99			# Interval to perform debits on.
-max_call_duration = test		# Maximum call duration a prepaid call can last
+max_call_duration = 99			# Maximum call duration a prepaid call can last
 
 [freeswitch]
 server = test			# Adress where to connect to FreeSWITCH socket.