diff --git a/CMake/toolchain/ios.toolchain.xcode.cmake b/CMake/toolchain/ios.toolchain.xcode.cmake
index c13b85226ed..67f59c885a2 100644
--- a/CMake/toolchain/ios.toolchain.xcode.cmake
+++ b/CMake/toolchain/ios.toolchain.xcode.cmake
@@ -46,7 +46,7 @@ set (CMAKE_OSX_DEPLOYMENT_TARGET "" CACHE STRING "Force unset of the deployment
 # Determine the cmake host system version so we know where to find the iOS SDKs
 find_program (CMAKE_UNAME uname /bin /usr/bin /usr/local/bin)
 if (CMAKE_UNAME)
-  exec_program(uname ARGS -r OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION)
+  execute_process(COMMAND uname ARGS -r OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION)
   string (REGEX REPLACE "^([0-9]+)\\.([0-9]+).*$" "\\1" DARWIN_MAJOR_VERSION "${CMAKE_HOST_SYSTEM_VERSION}")
 endif ()