diff --git a/Utilities/cmThirdPartyChecks.cmake b/Utilities/cmThirdPartyChecks.cmake
index 1d4c8674d8..fa3d8b67d2 100644
--- a/Utilities/cmThirdPartyChecks.cmake
+++ b/Utilities/cmThirdPartyChecks.cmake
@@ -212,6 +212,7 @@ if(WIN32)
   set(HAVE_STRUCT_VFSCONF 0)
   set(HAVE_STRUCT_XVFSCONF 0)
   set(HAVE_SYMLINK 0)
+  set(HAVE_SYSCONF 0)
   set(HAVE_SYS_ACL_H 0)
   set(HAVE_SYSCALL_GETRANDOM 0)
   set(HAVE_SYS_EVENTFD_H 0)