diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index df705e9ca..f1b59ba92 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -3103,7 +3103,8 @@ kwsys_stl::string SystemTools::GetOperatingSystemNameAndVersion()
   ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
   osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
 
-  if (!(bOsVersionInfoEx = GetVersionEx((OSVERSIONINFO *)&osvi)))
+  bOsVersionInfoEx = GetVersionEx((OSVERSIONINFO *)&osvi);
+  if (!bOsVersionInfoEx)
     {
     osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
     if (!GetVersionEx((OSVERSIONINFO *)&osvi))