diff --git a/CMakeLists.txt b/CMakeLists.txt
index ffb362f9b9..cf40054f91 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -402,7 +402,6 @@ if(CURL_USE_SCHANNEL)
 endif()
 if(CURL_WINDOWS_SSPI)
   set(USE_WINDOWS_SSPI ON)
-  list(APPEND CMAKE_REQUIRED_DEFINITIONS -DSECURITY_WIN32)
 endif()
 
 if(CURL_USE_SECTRANSP)