diff -r 604e7e335b3b -r 2e15ff88a0ab libidav/utils.c
--- a/libidav/utils.c	Sun Feb 04 15:58:07 2018 +0100
+++ b/libidav/utils.c	Sun Apr 01 12:40:48 2018 +0200
@@ -357,11 +357,11 @@
 #endif
 }
 
-char* util_concat_path(char *url_base, char *p) {
-    sstr_t base = sstr(url_base);
+char* util_concat_path(const char *url_base, const char *p) {
+    sstr_t base = sstr((char*)url_base);
     sstr_t path;
     if(p) {
-        path = sstr(p);
+        path = sstr((char*)p);
     } else {
         path = sstrn("", 0);
     }