diff --git a/CMake/win32-cache.cmake b/CMake/win32-cache.cmake
index 0036723b6e..5823fed99a 100644
--- a/CMake/win32-cache.cmake
+++ b/CMake/win32-cache.cmake
@@ -198,7 +198,6 @@ set(HAVE_GETHOSTBYNAME_R_5_REENTRANT 0)
 set(HAVE_GETHOSTBYNAME_R_6 0)
 set(HAVE_GETHOSTBYNAME_R_6_REENTRANT 0)
 
-set(HAVE_IN_ADDR_T 0)
 set(STDC_HEADERS 1)
 
 set(HAVE_SIZEOF_SUSECONDS_T 0)