diff --git a/qgroundcontrol.pro b/qgroundcontrol.pro
index 0b5b58c..498ff7e 100644
--- a/qgroundcontrol.pro
+++ b/qgroundcontrol.pro
@@ -45,6 +45,7 @@ linux {
     macx-clang | macx-llvm {
         message("Mac build")
         CONFIG += MacBuild
+        QMAKE_MAC_SDK = macosx10.9
     } else {
         error("Unsupported Mac toolchain, only 64-bit LLVM+clang is supported")
     }