diff --git a/EGkGdbConst.h b/EGkGdbConst.h
index f1a53d5..0b30e2e 100644
--- a/EGkGdbConst.h
+++ b/EGkGdbConst.h
@@ -77,3 +77,4 @@ enum BBoxFlag { BBF_STANDARD = 0,
 const std::string GDB_SI_SOURCE = "!SOU" ;
 const std::string GDB_SI_BASE = "!BAS" ;
 const std::string GDB_SI_LIST = "!LST" ;
+const std::string GDB_SI_COPY = "!COP" ;
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