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-rw-r--r--ext/date/date_parse.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/date/date_parse.c b/ext/date/date_parse.c
index 0378e50cf7..5fa036ed72 100644
--- a/ext/date/date_parse.c
+++ b/ext/date/date_parse.c
@@ -276,6 +276,7 @@ regcomp(const char *source, long len, int opt)
VALUE pat;
pat = rb_reg_new(source, len, opt);
+ rb_obj_freeze(pat);
rb_gc_register_mark_object(pat);
return pat;
}