diff --git a/json-c.spec b/json-c.spec
index b0026e8..e824cad 100644
--- a/json-c.spec
+++ b/json-c.spec
@@ -81,6 +81,9 @@ This package contains the reference manual for %{name}.
 # Remove pre-built html documentation.
 rm -fr doc/html
 
+# Update Doxyfile.
+doxygen -s -u doc/Doxyfile.in
+
 
 %build
 mkdir -p %{_vpath_builddir}
@@ -150,6 +153,7 @@ popd
 - Build using Ninja instead of Make
 - Add a patch to move Doxyfile into doc subdir
 - Remove pre-built html documentation
+- Update Doxyfile during %%prep
 
 * Mon May 25 2020 Björn Esser <besser82@fedoraproject.org> - 0.14-5
 - Run the testssuite with valgrind on %%valgrind_arches