1 files changed, 1 insertions, 1 deletions
diff --git a/include/mruby.h b/include/mruby.h
index 9aa5b2cd3..63c0fca3d 100644
--- a/include/mruby.h
+++ b/include/mruby.h
@@ -118,7 +118,7 @@ typedef struct {
   const char *filename;
   int lineno;
   struct RClass *klass;
-  const char *sep;
+  char sep;
   mrb_sym method_id;
 } mrb_backtrace_entry;