diff --git a/o3tl/qa/makefile.mk b/o3tl/qa/makefile.mk
index c91ba12d3202..5a71a7821325 100644
--- a/o3tl/qa/makefile.mk
+++ b/o3tl/qa/makefile.mk
@@ -75,6 +75,6 @@ unittest : $(SHL1TARGETN)
         @echo ----------------------------------------------------------
         @echo - start unit test on library $(SHL1TARGETN)
         @echo ----------------------------------------------------------
-        testshl2 $(SHL1TARGETN)
+        testshl2 -sf $(mktmp ) $(SHL1TARGETN)
 
 ALLTAR : unittest