diff --git a/CMakeLists.txt b/CMakeLists.txt
index 75317c917b..4cd3a2161c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1240,14 +1240,14 @@ if(WIN32)
   unset(HAVE_WIN32_WINNT CACHE)
 
   if(HAVE_WIN32_WINNT)
-    if(HAVE_WIN32_WINNT STRLESS "0x0501")
+    if(HAVE_WIN32_WINNT LESS 0x0501)
       # Windows XP is required for freeaddrinfo, getaddrinfo
       message(FATAL_ERROR "Building for Windows XP or newer is required.")
     endif()
 
     # Pre-fill detection results based on target OS version
     if(MINGW OR MSVC)
-      if(HAVE_WIN32_WINNT STRLESS "0x0600")
+      if(HAVE_WIN32_WINNT LESS 0x0600)
         set(HAVE_INET_NTOP 0)
         set(HAVE_INET_PTON 0)
       else()  # Windows Vista or newer
@@ -1814,7 +1814,7 @@ if(NOT CURL_DISABLE_INSTALL)
   _add_if("Unicode"       ENABLE_UNICODE)
   _add_if("threadsafe"    HAVE_ATOMIC OR
                           (USE_THREADS_POSIX AND HAVE_PTHREAD_H) OR
-                          (WIN32 AND HAVE_WIN32_WINNT GREATER_EQUAL 0x600))
+                          (WIN32 AND HAVE_WIN32_WINNT GREATER_EQUAL 0x0600))
   _add_if("Debug"         ENABLE_DEBUG)
   _add_if("TrackMemory"   ENABLE_CURLDEBUG)
   _add_if("ECH"           SSL_ENABLED AND HAVE_ECH)