diff --git a/doc/Doxygen/Doxyfile b/doc/Doxygen/Doxyfile
index 4f77b573a..15ee9f786 100644
--- a/doc/Doxygen/Doxyfile
+++ b/doc/Doxygen/Doxyfile
@@ -1634,7 +1634,8 @@ PAPER_TYPE             = a4wide
 # If left blank no extra packages will be included.
 # This tag requires that the tag GENERATE_LATEX is set to YES.
 
-EXTRA_PACKAGES         = $(WM_PROJECT_DIR)/doc/Doxygen/Macros/tensorOperator
+EXTRA_PACKAGES         = $(WM_PROJECT_DIR)/doc/Doxygen/Macros/tensorOperator \
+                         amsmath
 
 # The LATEX_HEADER tag can be used to specify a personal LaTeX header for the
 # generated LaTeX document. The header should contain everything until the first