diff --git a/include/swift/Config.h.in b/include/swift/Config.h.in
index a60eeb78487a2..263e3086c5724 100644
--- a/include/swift/Config.h.in
+++ b/include/swift/Config.h.in
@@ -1,5 +1,5 @@
 // This file is processed by CMake.
-// See http://www.cmake.org/cmake/help/v3.0/command/configure_file.html.
+// See https://cmake.org/cmake/help/v3.0/command/configure_file.html.
 
 #ifndef SWIFT_CONFIG_H
 #define SWIFT_CONFIG_H