diff --git a/Modules/CheckLanguage.cmake b/Modules/CheckLanguage.cmake
index 1fe9bc4d47..ccd6a1a329 100644
--- a/Modules/CheckLanguage.cmake
+++ b/Modules/CheckLanguage.cmake
@@ -151,6 +151,7 @@ file(WRITE \"\${CMAKE_CURRENT_BINARY_DIR}/result.cmake\" \"${_output_variables}\
       OUTPUT_VARIABLE _cl_output
       ERROR_VARIABLE _cl_output
       RESULT_VARIABLE _cl_result
+      TIMEOUT 120 # Avoid hanging forever on interactive popups.
       )
     include(${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/Check${lang}/result.cmake OPTIONAL)
     if(CMAKE_${lang}_COMPILER AND "${_cl_result}" STREQUAL "0")