1 files changed, 1 insertions, 0 deletions
diff --git a/string.c b/string.c
index 859018e5c1..526f476deb 100644
--- a/string.c
+++ b/string.c
@@ -8540,6 +8540,7 @@ sym_to_proc(VALUE sym)
     }
     else {
 	proc = rb_proc_new(sym_call, (VALUE)id);
+	rb_block_clear_env_self(proc);
 	aryp[index] = sym;
 	aryp[index + 1] = proc;
 	return proc;