diff --git a/ci/Jenkinsfile b/ci/Jenkinsfile
index cefdad6..24ed5aa 100644
--- a/ci/Jenkinsfile
+++ b/ci/Jenkinsfile
@@ -10,6 +10,7 @@ pipeline {
     stages {
         stage('Build') {
             steps {
+                sh './fixtimes.sh'
                 sh 'make'
             }
         }
diff --git a/fixtimes.sh b/fixtimes.sh
new file mode 100755
index 0000000..658d7b4
--- /dev/null
+++ b/fixtimes.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+git ls-files | while IFS= read -r file; do
+    ts=$(git log -1 --format=%at -- "${file}")
+    if [ -n "${ts}" ]; then
+        touch -d "@${ts}" -- "${file}"
+    fi
+done