1 files changed, 1 insertions, 0 deletions
diff --git a/iseq.c b/iseq.c
index de65dcbf33..9cf5df66a0 100644
--- a/iseq.c
+++ b/iseq.c
@@ -596,6 +596,7 @@ rb_iseq_compile_with_option(VALUE src, VALUE file, VALUE absolute_path, VALUE li
 	if (RB_TYPE_P((src), T_FILE))
 	    node = rb_parser_compile_file_path(parser, file, src, ln);
 	else {
+	    StringValue(src);
 	    node = rb_parser_compile_string_path(parser, file, src, ln);
 
 	    if (!node) {