diff --git a/libstdc++-v3/doc/doxygen/user.cfg.in b/libstdc++-v3/doc/doxygen/user.cfg.in
index 75108604a07..14981c96f95 100644
--- a/libstdc++-v3/doc/doxygen/user.cfg.in
+++ b/libstdc++-v3/doc/doxygen/user.cfg.in
@@ -152,7 +152,7 @@ FULL_PATH_NAMES        = NO
 # will be relative from the directory where doxygen is started.
 # This tag requires that the tag FULL_PATH_NAMES is set to YES.
 
-STRIP_FROM_PATH        =
+STRIP_FROM_PATH        = @srcdir@/doc/ @srcdir@/libsupc++/ include/
 
 # The STRIP_FROM_INC_PATH tag can be used to strip a user-defined part of the
 # path mentioned in the documentation of a class, which tells the reader which
@@ -837,6 +837,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
+# N.B. update STRIP_FROM_PATH to sanitize paths outside the build tree.
 INPUT                  = @srcdir@/doc/doxygen/doxygroups.cc \
                          @srcdir@/libsupc++/compare \
                          @srcdir@/libsupc++/cxxabi.h \