diff --git a/cmake/QtBaseConfigureTests.cmake b/cmake/QtBaseConfigureTests.cmake
index 50fc0c4fc0..af18131fcd 100644
--- a/cmake/QtBaseConfigureTests.cmake
+++ b/cmake/QtBaseConfigureTests.cmake
@@ -42,7 +42,8 @@ function(qt_run_config_test_architecture)
     endif()
     message(STATUS "Extracting architecture info from ${_arch_file}.")
 
-    file(STRINGS "${_arch_file}" _arch_lines LENGTH_MINIMUM 16 LENGTH_MAXIMUM 1024 ENCODING UTF-8)
+    file(STRINGS "${_arch_file}" _arch_lines LENGTH_MINIMUM 16 LENGTH_MAXIMUM 1024 ENCODING UTF-8
+         REGEX "==Qt=magic=Qt==")
 
     foreach (_line ${_arch_lines})
         string(LENGTH "${_line}" lineLength)