diff --git a/.gdbinit b/.gdbinit
index 7dd3336e28..1b5b6cb562 100644
--- a/.gdbinit
+++ b/.gdbinit
@@ -1344,4 +1344,4 @@ define print_flags
   printf "RUBY_FL_USER18      : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_USER18 ? "1" : "0"
 end
 
-source misc/gdb.py
+source -s misc/gdb.py