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-rw-r--r--ext/mwrap/mwrap.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/mwrap/mwrap.c b/ext/mwrap/mwrap.c
index 6875486..160007f 100644
--- a/ext/mwrap/mwrap.c
+++ b/ext/mwrap/mwrap.c
@@ -1115,6 +1115,7 @@ void Init_mwrap(void)
          * This class is only available since mwrap 2.0.0+.
          */
         cSrcLoc = rb_define_class_under(mod, "SourceLocation", rb_cObject);
+        rb_undef_alloc_func(cSrcLoc);
         rb_define_singleton_method(mod, "dump", mwrap_dump, -1);
         rb_define_singleton_method(mod, "reset", mwrap_reset, 0);
         rb_define_singleton_method(mod, "clear", mwrap_clear, 0);