1 files changed, 3 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 89cce7e69a..be522c8b09 100644
--- a/internal.h
+++ b/internal.h
@@ -443,6 +443,9 @@ void rb_gc_mark_global_tbl(void);
 void rb_mark_generic_ivar(VALUE);
 void rb_mark_generic_ivar_tbl(void);
 
+/* gc.c */
+size_t rb_gc_count();
+
 RUBY_SYMBOL_EXPORT_END
 
 #if defined(__cplusplus)