diff --git a/doc/doxygen.conf b/doc/doxygen.conf
index 75c015b61..a92153ea8 100644
--- a/doc/doxygen.conf
+++ b/doc/doxygen.conf
@@ -2204,7 +2204,7 @@ INCLUDE_FILE_PATTERNS  =
 
 PREDEFINED             = NS3_ASSERT_ENABLE \
                          NS3_LOG_ENABLE \
-                         NS_ABORT_MSG_UNLESS()=1 \
+                         NS_ABORT_MSG_UNLESS(x,y)=1 \
                          NS_LOG_COMPONENT_DEFINE()=1 \
                          NS_LOG_COMPONENT_DEFINE_MASK()=1 \
                          NS_OBJECT_ENSURE_REGISTERED()=1 \