diff --git a/doc/doxygen/Doxylocal b/doc/doxygen/Doxylocal
index be34fb5f968a1c3381be22e4dd7002d9b05b559f..4b763b3057579d061408bd796ab225f0ccb64c3b 100644
--- a/doc/doxygen/Doxylocal
+++ b/doc/doxygen/Doxylocal
@@ -5,4 +5,4 @@ EXAMPLE_PATTERNS       +=
 IMAGE_PATH             +=
 PREDEFINED             += DOXYGEN 
 
-EXTRA_PACKAGES         = amsmath
+EXTRA_PACKAGES         = amsmath amssymb