1 files changed, 2 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 1546b219e8..45b9eff0db 100644
--- a/internal.h
+++ b/internal.h
@@ -419,6 +419,8 @@ struct RSymbol {
 };
 
 #define RSYMBOL(obj) (R_CAST(RSymbol)(obj))
+#define SYMBOL_PINNED        FL_USER1
+#define SYMBOL_PINNED_P(sym) FL_TEST((sym), SYMBOL_PINNED)
 
 struct RFloat {
     struct RBasic basic;