diff --git a/tests/test_one.in b/tests/test_one.in
index 238b4b7..d053fd7 100644
--- a/tests/test_one.in
+++ b/tests/test_one.in
@@ -28,7 +28,7 @@ fi
 
 . $TEST_CONFIG
 
-TMPFILE=$(mktemp)
+TMPFILE=$(mktemp -t e2fsprogs-tmp.XXXXXX)
 
 test_name=`echo $test_dir | sed -e 's;.*/;;'`
 if [ -f $test_dir ] ; then