*san needs clang++ to link
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 209d544..a4750f5 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -1099,7 +1099,7 @@
 src/core/lib/surface/event_string.c \
 src/core/lib/surface/event_string.h \
 src/core/lib/surface/init.h \
-src/core/lib/surface/lame_client.c \
+src/core/lib/surface/lame_client.cc \
 src/core/lib/surface/lame_client.h \
 src/core/lib/surface/metadata_array.c \
 src/core/lib/surface/server.c \