diff --git a/cmake/QtAutoDetect.cmake b/cmake/QtAutoDetect.cmake
index 55020d7f1ef..21c49cb64ac 100644
--- a/cmake/QtAutoDetect.cmake
+++ b/cmake/QtAutoDetect.cmake
@@ -269,7 +269,7 @@ endfunction()
 
 function(qt_internal_get_darwin_sdk_version out_var)
     if(APPLE)
-        if(IOS)
+        if(CMAKE_SYSTEM_NAME STREQUAL iOS)
             set(sdk_name "iphoneos")
         else()
             # Default to macOS