diff --git a/models/variables/variables.go b/models/variables/variables.go
index 7cccae1..fe2e343 100644
--- a/models/variables/variables.go
+++ b/models/variables/variables.go
@@ -21,7 +21,7 @@ var (
 	*/
 	RootRoute = "/"
 
-	AddTempRoute      = "/add/temp/" + sensorMacRegex + "/:val(-+[0-9]+)"
+	AddTempRoute      = "/add/temp/" + sensorMacRegex + "/:val([-]{0,1}[0-9]+)"
 	AddRelayRoute     = "/add/relay/" + sensorMacRegex
 	TeleinfoAddRoute  = "/teleinfo/add"
 	AddSoilMoistRoute = "/add/soil" /* Route for soil moisture sensors*/