diff --git a/src/FlowSensor_Type.h b/src/FlowSensor_Type.h
index 1cf8220..74be9a7 100644
--- a/src/FlowSensor_Type.h
+++ b/src/FlowSensor_Type.h
@@ -14,6 +14,7 @@
 // -----------------------
 // YF
 #define YFS201	450
+#define YFB5 450
 #define YFB1	660
 #define YFS401	5880
 #define YFB1S   1077