1 files changed, 1 insertions, 1 deletions
diff --git a/parse.y b/parse.y
index b12f3a4429..f7a85d299e 100644
--- a/parse.y
+++ b/parse.y
@@ -225,7 +225,7 @@ struct parser_params {
     struct local_vars *lvtbl;
     int line_count;
     int ruby_sourceline;	/* current line no. */
-    char *ruby_sourcefile; /* current source file */
+    const char *ruby_sourcefile; /* current source file */
     VALUE ruby_sourcefile_string;
     rb_encoding *enc;
     token_info *token_info;