diff --git a/plugins/include/amxconst.inc b/plugins/include/amxconst.inc
index aad23205..45f838d2 100755
--- a/plugins/include/amxconst.inc
+++ b/plugins/include/amxconst.inc
@@ -224,7 +224,12 @@ public stock const Float:NULL_VECTOR[3];
 /**
  * Placeholder that replaces the admin name in show_activity_custom()
  */
-#define ACTIVITY_ADMIN_NAME "$an"
+#define ACTIVITY_STR_NAME      "$an"
+
+/**
+ * Placeholder that replaces the client prefix in show_activity_custom()
+ */
+#define ACTIVITY_STR_PREFIX    "$px"
 
 /**
  * @section Client print native constants