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-rw-r--r--src/string.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/string.c b/src/string.c
index da475839c..d4dc517cf 100644
--- a/src/string.c
+++ b/src/string.c
@@ -494,7 +494,7 @@ static void
check_frozen(mrb_state *mrb, struct RString *s)
{
if (MRB_FROZEN_P(s)) {
- mrb_raise(mrb, E_RUNTIME_ERROR, "can't modify frozen string");
+ mrb_raise(mrb, E_FROZEN_ERROR, "can't modify frozen string");
}
}