diff --git a/BuildBotLib/cmake.py b/BuildBotLib/cmake.py
index 7bc6cd4..b86af12 100644
--- a/BuildBotLib/cmake.py
+++ b/BuildBotLib/cmake.py
@@ -162,6 +162,7 @@ class CMake(Make):
         defines += [
             '-DCMAKE_PREFIX_PATH=$QTDIR',
             '-DCMAKE_XCODE_ATTRIBUTE_DEVELOPMENT_TEAM=$XCODE_DEVELOPMENT_TEAM',
+            '-DCMAKE_OSX_DEPLOYMENT_TARGET=$IOS_TARGET',
             '-DCMAKE_TOOLCHAIN_FILE=$CMAKE_TOOL_CHAIN_FILE',
             '-DPLATFORM=OS64',
             '-B cmake_build'