diff --git a/src/main.cpp b/src/main.cpp
index cc179f6..5dafd44 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -217,7 +217,7 @@ void setup() {
   static st::EX_Switch izhod1(F("izhod_28"), 28, LOW);
   static st::EX_Switch izhod2(F("izhod_29"), 29, LOW);
   static st::EX_Switch izhod3(F("izhod_30"), 30, LOW);
-  static st::EX_Switch izhod4(F("izhod_21"), 31, LOW);
+  static st::EX_Switch izhod4(F("izhod_31"), 31, LOW);
 
   //*****************************************************************************
   //  Configure debug print output from each main class