diff --git a/apps/hfs65.c b/apps/hfs65.c
index 36b87c5..a1a4db3 100644
--- a/apps/hfs65.c
+++ b/apps/hfs65.c
@@ -214,7 +214,7 @@ void image()
 }
 #endif
 
-void http_server(unsigned long client, const char* method, const char* path)
+void http_server(uint32_t client, const char* method, const char* path)
 {
   char* delimiter;