diff --git a/cmuratori/hero/ray/ray00.hmml b/cmuratori/hero/ray/ray00.hmml
index 8308a0c..e5082c3 100644
--- a/cmuratori/hero/ray/ray00.hmml
+++ b/cmuratori/hero/ray/ray00.hmml
@@ -11,7 +11,7 @@
 [23:18][ray.cpp: Write to a file using fwrite()[ref
     site="cplusplus"
     page="fwrite"
-    url="https://www.cplusplus.com/reference/cstdio/fwrite/"]]
+    url="http://www.cplusplus.com/reference/cstdio/fwrite/"]]
 [29:43][ray.cpp: typedef our types]
 [31:17][Step through the code and try unsuccessfully to read our bitmap image]
 [32:58][ray.cpp: Fill in the bitmap Header[ref