1 files changed, 1 insertions, 1 deletions
diff --git a/error.c b/error.c
index f97452941b..9633e9e252 100644
--- a/error.c
+++ b/error.c
@@ -1258,7 +1258,7 @@ Init_syserr(void)
 #undef undefined_error
 }
 
-char *
+const char *
 rb_strerrno(int err)
 {
     if (err == 0) return "NOERROR";