diff --git a/ml/cleantmp.cmd b/ml/cleantmp.cmd
index 6d4e12849..257e26a96 100644
--- a/ml/cleantmp.cmd
+++ b/ml/cleantmp.cmd
@@ -9,7 +9,7 @@ REM files produced by compile_mlapi.cmd
 del /q 2>NUL *.cmi *.cmo *.cmx *.cma *.cmxa *.obj *.lib *.pdb ocamlz3.exe
 
 REM files produced by test_mlapi.cmd
-del /q 2>NUL test*.exe queen*.exe test_*api.out test_*apiV3.out test_*api.err test_*apiV3.err queen.out queen.err z3.log ml.log test_mlapi.log
+del /q 2>NUL test*.exe queen*.exe test_*api.out test_*apiV3.out test_*api.err test_*apiV3.err queen.out queen.err z3.log ml.log test_mlapi.log .z3-trace
 
 REM backup files
 del /q 2>NUL *~