diff --git i/tests/test-yacas w/tests/test-yacas
index b375d78b..0e3a616b 100755
--- i/tests/test-yacas
+++ w/tests/test-yacas
@@ -35,9 +35,9 @@ FAILED_TESTS=""  # list of failed tests
 FAILURES=0       # number of failed tests
 TOTALTESTS=0     # total number of tests
 
-TESTFILE=/tmp/test-yacas.$$
-TIMEFILE=/tmp/time-yacas.$$
-VERSIONF=/tmp/version-yacas-$$.ys
+TESTFILE="$(mktemp -t test-yacas.XXX)"
+TIMEFILE="$(mktemp -t time-yacas.XXX)"
+VERSIONF="$(mktemp -t version-yacas-XXX.ys)"
 LOGFILE=yacas-logfile.txt
 echo "Print(Version());" > $VERSIONF
 VERSION=`$CMD $VERSIONF`
@@ -69,7 +69,7 @@ for scr in $SCRIPTS; do
 #		fi
     echo "Running $scr"
 	if [ -f $TESTFILE ]; then rm $TESTFILE ; fi
-    /bin/bash -c "time -p ($CMD $f || echo \"Error: exit status $?\") | tee $TESTFILE" \
+	    bash -c "time -p ($CMD $f || echo \"Error: exit status $?\") | tee $TESTFILE" \
 		2> $TIMEFILE \
 		|| (echo "Error -- User interrupt" > $TESTFILE)
 #	cat $TIMEFILE