diff --git a/docs/symbols.txt b/docs/symbols.txt
index 65612ab69c..1b72400ec2 100644
--- a/docs/symbols.txt
+++ b/docs/symbols.txt
@@ -51,6 +51,6 @@ __XLC__         ?? compiler
 wxWindows modes:
 ----------------
 
-__DEBUG__       usage: #ifdef __DEBUG__ (=> debug mode, else => release)
+__WXDEBUG__       usage: #ifdef __DEBUG__ (=> debug mode, else => release)
 WXDEBUG         usage: #if DEBUG (0: release, 1: minimal debug code, ...)