diff --git a/src/conf-yaml-loader.c b/src/conf-yaml-loader.c
index 0c5e7a5633..a011ba697d 100644
--- a/src/conf-yaml-loader.c
+++ b/src/conf-yaml-loader.c
@@ -82,7 +82,7 @@ Mangle(char *string)
 static void
 ConfYamlSetConfDirname(const char *filename)
 {
-    char *ep;
+    const char *ep;
 
     ep = strrchr(filename, '\\');
     if (ep == NULL)