1 files changed, 2 insertions, 0 deletions
diff --git a/string.c b/string.c
index 8af608047a..9da5708964 100644
--- a/string.c
+++ b/string.c
@@ -7231,6 +7231,8 @@ str_undump(VALUE str)
         }
     }
 
+    RB_GC_GUARD(str);
+
     return undumped;
 invalid_format:
     rb_raise(rb_eRuntimeError, "invalid dumped string; not wrapped with '\"' nor '\"...\".force_encoding(\"...\")' form");