diff --git a/sonoff/language/cs-CZ.h b/sonoff/language/cs-CZ.h
index 3886c1b4d..570cfd4c8 100644
--- a/sonoff/language/cs-CZ.h
+++ b/sonoff/language/cs-CZ.h
@@ -502,6 +502,7 @@
 #define D_UNIT_CENTIMETER "cm"
 #define D_UNIT_HERTZ "Hz"
 #define D_UNIT_HOUR "hod"
+#define D_UNIT_INCREMENTS "inc"
 #define D_UNIT_KILOOHM "kOhm"
 #define D_UNIT_KILOWATTHOUR "kWh"
 #define D_UNIT_LUX "lx"