diff --git a/workspace/TS100/Core/Threads/GUIThread.cpp b/workspace/TS100/Core/Threads/GUIThread.cpp
index 1079fb0a..daa3f51b 100644
--- a/workspace/TS100/Core/Threads/GUIThread.cpp
+++ b/workspace/TS100/Core/Threads/GUIThread.cpp
@@ -304,7 +304,7 @@ static int gui_SolderingSleepingMode(bool stayOff) {
 			return 0;
 		}
 
-#ifdef POW_PD
+#ifdef POW_DC
 		if (checkVoltageForExit())
 			return 1; // return non-zero on error
 #endif