diff --git a/parser-cfg.c b/parser-cfg.c
index 2b1f354d85..ff3d9f2d34 100644
--- a/parser-cfg.c
+++ b/parser-cfg.c
@@ -35,7 +35,7 @@ static int recursion_depth = 0;
  *  \param conffile Path to the config file.
  *  \return 1 on sucess, -1 on error.
  */
-int m_config_parse_config_file(m_config_t* config, char *conffile)
+int m_config_parse_config_file(m_config_t* config, const char *conffile)
 {
 #define PRINT_LINENUM	mp_msg(MSGT_CFGPARSER,MSGL_V,"%s(%d): ", conffile, line_num)
 #define MAX_LINE_LEN	10000
diff --git a/parser-cfg.h b/parser-cfg.h
index d69f77106a..ed5e64c6a4 100644
--- a/parser-cfg.h
+++ b/parser-cfg.h
@@ -3,7 +3,7 @@
 
 #include "m_config.h"
 
-int m_config_parse_config_file(m_config_t* config, char *conffile);
+int m_config_parse_config_file(m_config_t* config, const char *conffile);
 
 int m_config_preparse_command_line(m_config_t *config, int argc, char **argv);