1 files changed, 2 insertions, 0 deletions
diff --git a/string.c b/string.c
index e1bb65599..13c98ad33 100644
--- a/string.c
+++ b/string.c
@@ -28,6 +28,8 @@
 #undef rb_str_new2
 #undef rb_tainted_str_new2
 #undef rb_usascii_str_new2
+#undef rb_str_buf_cat2
+#undef rb_str_cat2
 
 VALUE rb_cString;
 VALUE rb_cSymbol;