diff --git a/include/twl/os/common/system.h b/include/twl/os/common/system.h
index 3684765..494d7d9 100644
--- a/include/twl/os/common/system.h
+++ b/include/twl/os/common/system.h
@@ -30,7 +30,8 @@ extern "C" {
 typedef enum
 {
     OS_CHIPTYPE_PRODUCT = 0,
-    OS_CHIPTYPE_ALL_DEBUGGER = 1,
+    OS_CHIPTYPE_DEBUGGER_BOTH = 1,
+    OS_CHIPTYPE_DEBUGGER_ARM9 = 1,
     OS_CHIPTYPE_EVALUATE = 3
 }
 OSChipType;