1 files changed, 1 insertions, 0 deletions
diff --git a/intern.h b/intern.h
index b8af605292..b251a83f0b 100644
--- a/intern.h
+++ b/intern.h
@@ -239,6 +239,7 @@ VALUE rb_file_directory_p _((VALUE,VALUE));
 NORETURN(void rb_memerror __((void)));
 int ruby_stack_check _((void));
 int ruby_stack_length _((VALUE**));
+int rb_during_gc _((void));
 char *rb_source_filename _((const char*));
 void rb_gc_mark_locations _((VALUE*, VALUE*));
 void rb_mark_tbl _((struct st_table*));