diff --git a/doc/api/Doxyfile.pim b/doc/api/Doxyfile.pim
index 62cf6790..2f238502 100644
--- a/doc/api/Doxyfile.pim
+++ b/doc/api/Doxyfile.pim
@@ -930,7 +930,7 @@ INCLUDE_FILE_PATTERNS  =
 
 PREDEFINED             = TQT_VERSION=320 \
                          __cplusplus \
-                         Q_WS_X11
+                         TQ_WS_X11
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then 
 # this tag can be used to specify a list of macro names that should be expanded.