diff --git a/g2core/Makefile b/g2core/Makefile
index 2850734c0..c2b2558bd 100644
--- a/g2core/Makefile
+++ b/g2core/Makefile
@@ -59,7 +59,7 @@ ifeq ($(DEBUG),2)
 	DEVICE_DEFINES += DEBUG=1 IN_DEBUGGER=1
 endif
 ifeq ($(DEBUG),3)
-	DEVICE_DEFINES += DEBUG=1 IN_DEBUGGER=1 DEBUG_SEMIHOSTING=1
+	DEVICE_DEFINES += DEBUG=1 IN_DEBUGGER=1 DEBUG_SEMIHOSTING=1 DEBUG_USE_ITM=1
 endif
 #ifeq ($(DEBUG),3)
 #    DEVICE_DEFINES += DEBUG=1 IN_DEBUGGER=1 DEBUG_SEMIHOSTING=1