diff --git a/src/config/home.c b/src/config/home.c
index 4354aafd7..e075d38b1 100644
--- a/src/config/home.c
+++ b/src/config/home.c
@@ -40,7 +40,7 @@ strip_trailing_dir_sep(char *path)
 }
 
 static char *
-test_confdir(char *home, char *path,
+test_confdir(const char *home, const char *path,
 	     char *error_message)
 {
 	struct stat st;