diff --git a/PocoDoc/cfg/mkdocumentation.xml b/PocoDoc/cfg/mkdocumentation.xml
index 5c72451a8..74553a98c 100644
--- a/PocoDoc/cfg/mkdocumentation.xml
+++ b/PocoDoc/cfg/mkdocumentation.xml
@@ -37,7 +37,8 @@
 				-D_DEBUG,
 				-E,
 				-C,
-				-DPOCO_NO_GCC_API_ATTRIBUTE
+				-DPOCO_NO_GCC_API_ATTRIBUTE,
+				-DPOCO_DOC
 			</options>
 			<path></path>
 			<usePipe>true</usePipe>