diff --git a/AUTOTEST/cmake.bat b/AUTOTEST/cmake.bat
index 95d3b5105..8f3c51e95 100755
--- a/AUTOTEST/cmake.bat
+++ b/AUTOTEST/cmake.bat
@@ -60,7 +60,7 @@ type NUL > cmake.err
 for %%f in (%outdir%\*.out) do (
     set sum=0
     for /f "tokens=1" %%i in ('findstr "Error(s)" %%f') do set /a sum+=%%i
-    if %sum% gtr 0 @echo %%f > cmake.err
+    if %sum% gtr 0 @echo %%f >> cmake.err
 )
 
 cd %rundir%
diff --git a/AUTOTEST/machine-vs-pro.bat b/AUTOTEST/machine-vs-pro.bat
index c6dba9606..b3a74eabe 100755
--- a/AUTOTEST/machine-vs-pro.bat
+++ b/AUTOTEST/machine-vs-pro.bat
@@ -19,6 +19,9 @@ set srcdir=%cd%
 rem output directory is a subdirectory of rundir
 set outdir=%rundir%\machine-vs-pro.dir
 
+rem autotest log file
+set logfile=%rundir%\autotest-machine-vs-pro.log
+
 rem create clean output directory
 if exist %outdir% rmdir /s /q %outdir%
 mkdir %outdir%
@@ -27,6 +30,8 @@ rem run the cmake.bat script from rundir in a subshell to avoid overwriting vari
 rem (i.e., use 'cmd /c')
 cd %rundir%
 
+@echo Test started at %time% on %date% > %logfile%
+
 cmd /c %scriptdir%\cmake.bat %srcdir% " "
 move %rundir%\cmake.dir %outdir%\cmake-default.dir
 move %rundir%\cmake.err %outdir%\cmake-default.err
@@ -50,6 +55,8 @@ for %%f in (%outdir%\*.err) do (
     if %%~zf gtr 0 @echo %%f >> machine-vs-pro.err
 )
 
+@echo Test finished at %time% on %date% >> %logfile%
+
 cd %rundir%
 
 endlocal