diff --git a/cmake/QtBaseConfigureTests.cmake b/cmake/QtBaseConfigureTests.cmake
index b62eec84104..7713def6bf2 100644
--- a/cmake/QtBaseConfigureTests.cmake
+++ b/cmake/QtBaseConfigureTests.cmake
@@ -73,7 +73,7 @@ function(qt_run_config_test_architecture)
             string(SUBSTRING "${_line}" ${_pos} -1 _architecture)
         endif()
         string(FIND "${_line}" "==Qt=magic=Qt== Sub-architecture:" _pos)
-        if (_pos GREATER -1 AND ${lineLength} GREATER 33)
+        if (_pos GREATER -1 AND NOT _line MATCHES "Sub-architecture:$")
             math(EXPR _pos "${_pos}+34")
             string(SUBSTRING "${_line}" ${_pos} -1 _sub_architecture)
             string(REPLACE " " ";" _sub_architecture "${_sub_architecture}")