diff --git a/apache2/msc_json.c b/apache2/msc_json.c
index 1909f9b52e..3a7a03d728 100644
--- a/apache2/msc_json.c
+++ b/apache2/msc_json.c
@@ -16,7 +16,7 @@
 
 #ifdef WITH_YAJL
 
-char *base_offset=NULL;
+const char *base_offset=NULL;
 
 int json_add_argument(modsec_rec *msr, const char *value, unsigned length)
 {