1 files changed, 1 insertions, 0 deletions
diff --git a/parse.y b/parse.y
index 96a7fd6edd..067775edfb 100644
--- a/parse.y
+++ b/parse.y
@@ -3960,6 +3960,7 @@ str_extend(list, term, paren)
 		goto refetch;
 	    }
 	    if (!is_identchar(c)) {
+	      pushback(c);
 	      invalid_interporate:
 		{
 		    VALUE s = rb_str_new2("#");