diff --git a/.gdbinit b/.gdbinit
index 7a79da5dcb..e2a34f3715 100644
--- a/.gdbinit
+++ b/.gdbinit
@@ -50,7 +50,7 @@ define rp
     end
   else
   set $flags = ((struct RBasic*)($arg0))->flags
-  if ($flags & RUBY_FL_PROMOTED)
+  if ($flags & RUBY_FL_PROMOTED) == RUBY_FL_PROMOTED
     printf "[PROMOTED] "
   end
   if ($flags & RUBY_T_MASK) == RUBY_T_NONE
diff --git a/debug.c b/debug.c
index a8bbb0fd28..15c1ea8b9e 100644
--- a/debug.c
+++ b/debug.c
@@ -35,6 +35,7 @@ const union {
         RUBY_ENC_CODERANGE_BROKEN  = ENC_CODERANGE_BROKEN,
         RUBY_FL_PROMOTED0   = FL_PROMOTED0,
         RUBY_FL_PROMOTED1   = FL_PROMOTED1,
+        RUBY_FL_PROMOTED    = FL_PROMOTED0|FL_PROMOTED1,
         RUBY_FL_FINALIZE    = FL_FINALIZE,
         RUBY_FL_TAINT       = FL_TAINT,
         RUBY_FL_EXIVAR      = FL_EXIVAR,