diff --git a/docs/doxygen/Doxyfile_all b/docs/doxygen/Doxyfile_all
index 55d89e5810..384b7af416 100644
--- a/docs/doxygen/Doxyfile_all
+++ b/docs/doxygen/Doxyfile_all
@@ -22,5 +22,5 @@ GENERATE_MAN           = NO
 GENERATE_XML           = YES
 GENERATE_AUTOGEN_DEF   = NO
 GENERATE_PERLMOD       = YES
-GENERATE_TAGFILE       = NO
+GENERATE_TAGFILE       =