diff --git a/Source/cmStateSnapshot.cxx b/Source/cmStateSnapshot.cxx
index 80e494b686..d2c9d737f9 100644
--- a/Source/cmStateSnapshot.cxx
+++ b/Source/cmStateSnapshot.cxx
@@ -308,7 +308,7 @@ void cmStateSnapshot::SetDefaultDefinitions()
   this->SetDefinition("CMAKE_HOST_UNIX", "1");
 
   struct utsname uts_name;
-  if (uname(&uts_name) == 0) {
+  if (uname(&uts_name) >= 0) {
     this->SetDefinition("CMAKE_HOST_SYSTEM_NAME", uts_name.sysname);
   }
 #endif