diff --git a/test_suite/scripts/start_test.sh b/test_suite/scripts/start_test.sh
index f400efd5..dd17f082 100755
--- a/test_suite/scripts/start_test.sh
+++ b/test_suite/scripts/start_test.sh
@@ -179,7 +179,7 @@ marker_file="i_am_a_testdirectory"
 
 # check some preconditions
 
-check_list="truncate grep sed gawk head tail cut nice date gzip gunzip zcat buffer"
+check_list="truncate grep sed gawk head tail cut nice date gzip gunzip zcat buffer pstree"
 check_installed "$check_list"
 
 # include modules