diff --git a/doc/doxygen.in b/doc/doxygen.in
index c2abb45ee605cb2c2d6f9d7b5bdb0fd57c0dfacf..a98ddcec124a1f973381240d1d5dcbaa5bf91b77 100644
--- a/doc/doxygen.in
+++ b/doc/doxygen.in
@@ -38,7 +38,7 @@ PROJECT_NAME           = " waLBerla "
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 3.0
+PROJECT_NUMBER         = @WALBERLA_VERSION@
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a