diff --git a/doc/doxygen.conf b/doc/doxygen.conf
index 291d3f9df..cbc47ff2d 100644
--- a/doc/doxygen.conf
+++ b/doc/doxygen.conf
@@ -1566,6 +1566,9 @@ SEARCH_INCLUDES        = YES
 
 INCLUDE_PATH           =
 
+# Allow doxygen to find generated include files, such as ns3/core-config.h
+INCLUDE_PATH          += build
+
 # You can use the INCLUDE_FILE_PATTERNS tag to specify one or more wildcard
 # patterns (like *.h and *.hpp) to filter out the header-files in the
 # directories. If left blank, the patterns specified with FILE_PATTERNS will