diff --git a/tools/memory_tracker.sh b/tools/memory_tracker.sh
index 63f25ca2de..6c36534f01 100755
--- a/tools/memory_tracker.sh
+++ b/tools/memory_tracker.sh
@@ -14,7 +14,7 @@
 
 set -o errexit
 
-PYTHON=${PYTHON:-python}
+PYTHON=${PYTHON:-python3}
 
 # time to sleep between checks
 SLEEP_TIME=20
diff --git a/tools/mlock_report.py b/tools/mlock_report.py
old mode 100755
new mode 100644
index 07716b04d6..b15a0bf80b
--- a/tools/mlock_report.py
+++ b/tools/mlock_report.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 # This tool lists processes that lock memory pages from swapping to disk.
 
 import re