diff --git a/v1/tru64cxx65-tools.jam b/v1/tru64cxx65-tools.jam
index 4194b35da..70fa3482b 100644
--- a/v1/tru64cxx65-tools.jam
+++ b/v1/tru64cxx65-tools.jam
@@ -23,7 +23,8 @@
 
 # No static linking as far as I can tell.
 # flags cxx LINKFLAGS <runtime-link>static : -bstatic ;
-flags cxx CFLAGS <debug-symbols>on : -g ;
+flags tru64cxx65 CFLAGS <debug-symbols>on : -g ;
+flags tru64cxx65 C++FLAGS <debug-symbols>on : -gall ;
 flags tru64cxx65 LINKFLAGS <debug-symbols>on : -g ;
 flags tru64cxx65 LINKFLAGS <debug-symbols>off : -s ;
 flags tru64cxx65 LINKFLAGS <target-type>$(SHARED_TYPES) : -shared -expect_unresolved 'Py*' -expect_unresolved '_Py*' ;