diff --git a/Modules/CMakeDetermineSystem.cmake b/Modules/CMakeDetermineSystem.cmake
index 86755533684ada19e329f239715e30d027aef713..f34ec5d615b98bf24f3851351f4230646d0fb0a7 100644
--- a/Modules/CMakeDetermineSystem.cmake
+++ b/Modules/CMakeDetermineSystem.cmake
@@ -35,10 +35,9 @@
 if(CMAKE_HOST_UNIX)
   find_program(CMAKE_UNAME uname /bin /usr/bin /usr/local/bin )
   if(CMAKE_UNAME)
-    exec_program(uname ARGS -s OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_NAME)
-    exec_program(uname ARGS -r OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION)
+    exec_program(${CMAKE_UNAME} ARGS -r OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION)
     if(CMAKE_HOST_SYSTEM_NAME MATCHES "Linux|CYGWIN.*|Darwin|^GNU$")
-      exec_program(uname ARGS -m OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_PROCESSOR
+      exec_program(${CMAKE_UNAME} ARGS -m OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_PROCESSOR
         RETURN_VALUE val)
       if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin" AND
          CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "Power Macintosh")
@@ -49,10 +48,10 @@ if(CMAKE_HOST_UNIX)
       exec_program(arch ARGS -s OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_PROCESSOR
         RETURN_VALUE val)
     else()
-      exec_program(uname ARGS -p OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_PROCESSOR
+      exec_program(${CMAKE_UNAME} ARGS -p OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_PROCESSOR
         RETURN_VALUE val)
       if("${val}" GREATER 0)
-        exec_program(uname ARGS -m OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_PROCESSOR
+        exec_program(${CMAKE_UNAME} ARGS -m OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_PROCESSOR
           RETURN_VALUE val)
       endif()
     endif()
@@ -67,7 +66,6 @@ if(CMAKE_HOST_UNIX)
   endif()
 else()
   if(CMAKE_HOST_WIN32)
-    set (CMAKE_HOST_SYSTEM_NAME "Windows")
     if (DEFINED ENV{PROCESSOR_ARCHITEW6432})
       set (CMAKE_HOST_SYSTEM_PROCESSOR "$ENV{PROCESSOR_ARCHITEW6432}")
     else()
diff --git a/Source/cmStateSnapshot.cxx b/Source/cmStateSnapshot.cxx
index c6288a56e4089c92625da7ef5ab1e30c6655dd13..80e494b686d1500215a6993e6ed09971ebcf9bec 100644
--- a/Source/cmStateSnapshot.cxx
+++ b/Source/cmStateSnapshot.cxx
@@ -18,6 +18,10 @@
 #include "cmVersion.h"
 #include "cmake.h"
 
+#if !defined(_WIN32)
+#include <sys/utsname.h>
+#endif
+
 #if defined(__CYGWIN__)
 #include "cmSystemTools.h"
 #endif
@@ -298,9 +302,15 @@ void cmStateSnapshot::SetDefaultDefinitions()
 #if defined(_WIN32)
   this->SetDefinition("WIN32", "1");
   this->SetDefinition("CMAKE_HOST_WIN32", "1");
+  this->SetDefinition("CMAKE_HOST_SYSTEM_NAME", "Windows");
 #else
   this->SetDefinition("UNIX", "1");
   this->SetDefinition("CMAKE_HOST_UNIX", "1");
+
+  struct utsname uts_name;
+  if (uname(&uts_name) == 0) {
+    this->SetDefinition("CMAKE_HOST_SYSTEM_NAME", uts_name.sysname);
+  }
 #endif
 #if defined(__CYGWIN__)
   std::string legacy;
diff --git a/Tests/CMakeTests/ToolchainTest.cmake.in b/Tests/CMakeTests/ToolchainTest.cmake.in
index 96e7196a54daf6cd816e7d01bb59667c695161b7..ea44f42df8c69361cab223f39af1711646bf3b46 100644
--- a/Tests/CMakeTests/ToolchainTest.cmake.in
+++ b/Tests/CMakeTests/ToolchainTest.cmake.in
@@ -48,7 +48,6 @@ set(CMAKE_SYSTEM_NAME)
 set(CMAKE_SYSTEM_VERSION)
 set(CMAKE_SYSTEM_PROCESSOR)
 set(CMAKE_HOST_SYSTEM)
-set(CMAKE_HOST_SYSTEM_NAME)
 set(CMAKE_HOST_SYSTEM_VERSION)
 set(CMAKE_HOST_SYSTEM_PROCESSOR)