diff --git a/cmake/QtProcessConfigureArgs.cmake b/cmake/QtProcessConfigureArgs.cmake
index 9cfd6a2da2c..68584dfc612 100644
--- a/cmake/QtProcessConfigureArgs.cmake
+++ b/cmake/QtProcessConfigureArgs.cmake
@@ -926,7 +926,7 @@ translate_string_input(android-javac-target QT_ANDROID_JAVAC_TARGET)
 
 translate_string_input(sdk QT_APPLE_SDK)
 
-if(DEFINED INPUT_sdk OR (DEFINED INPUT_xplatform AND INPUT_xplatform STREQUAL "macx-ios-clang")
+if((DEFINED INPUT_xplatform AND INPUT_xplatform STREQUAL "macx-ios-clang")
     OR (DEFINED INPUT_platform AND INPUT_platform STREQUAL "macx-ios-clang"))
     push("-DCMAKE_SYSTEM_NAME=iOS")
 endif()