diff --git a/Externals/curl/lib/CMakeLists.txt b/Externals/curl/lib/CMakeLists.txt
index 00b6a7c2cc..d1f6d10345 100644
--- a/Externals/curl/lib/CMakeLists.txt
+++ b/Externals/curl/lib/CMakeLists.txt
@@ -1,5 +1,7 @@
-if(NOT CMAKE_SYSTEM_NAME MATCHES "Windows")
-  add_definitions(-DHAVE_CONFIG_H)
+if(CMAKE_SYSTEM_NAME MATCHES "Windows")
+    add_definitions(-DUSE_SCHANNEL -DUSE_WINDOWS_SSPI)
+else()
+    add_definitions(-DHAVE_CONFIG_H)
 endif()
 
 include_directories(.)