diff --git a/Tests/RunCMake/RunCMake.cmake b/Tests/RunCMake/RunCMake.cmake
index 00faa4ca7..f770c9368 100644
--- a/Tests/RunCMake/RunCMake.cmake
+++ b/Tests/RunCMake/RunCMake.cmake
@@ -52,6 +52,7 @@ function(run_cmake test)
     set(msg "${msg}Result is [${actual_result}], not [${expect_result}].\n")
   endif()
   foreach(o out err)
+    string(REGEX REPLACE "(^|\n)(==[0-9]+==[^\n]*\n)+" "\\1" actual_std${o} "${actual_std${o}}")
     string(REGEX REPLACE "\n+$" "" actual_std${o} "${actual_std${o}}")
     set(expect_${o} "")
     if(DEFINED expect_std${o})