diff --git a/vpx/vpx_ext_ratectrl.h b/vpx/vpx_ext_ratectrl.h
index 28dccea09fd..182d6b7b36b 100644
--- a/vpx/vpx_ext_ratectrl.h
+++ b/vpx/vpx_ext_ratectrl.h
@@ -553,7 +553,7 @@ typedef struct vpx_rc_funcs {
   /*!
    * Rate control log path.
    */
-  char *rate_ctrl_log_path;
+  const char *rate_ctrl_log_path;
   /*!
    * Private data for the external rate control model.
    */