diff --git a/CHANGELOG.md b/CHANGELOG.md
index 237eaafc..b463566c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fix bench tests missing test_file var
+- Fix compatibility with older python versions for clock::now
 
 ## [0.25.0](https://github.com/TypedDevs/bashunit/compare/0.23.0...0.24.0) - 2025-10-05
 
diff --git a/src/clock.sh b/src/clock.sh
index 27aed6cf..f0153aeb 100644
--- a/src/clock.sh
+++ b/src/clock.sh
@@ -76,7 +76,7 @@ function clock::now() {
     python)
       python - <<'EOF'
 import time, sys
-sys.stdout.write(str(int(time.time() * 1_000_000_000)))
+sys.stdout.write(str(int(time.time() * 1000000000)))
 EOF
       ;;
     node)