diff --git a/vars/mergeJunitResults.groovy b/vars/mergeJunitResults.groovy
index 56495be..e23649f 100644
--- a/vars/mergeJunitResults.groovy
+++ b/vars/mergeJunitResults.groovy
@@ -3,7 +3,7 @@ def request = libraryResource 'com/mycorp/pipeline/somelib/request.json'
 def call() {
     tmpdir = env.TMPDIR ? env.TMPDIR : '.'
     writeFile file:"${tmpdir}/merge-junit-results.py", text: libraryResource('merge-junit-results.py')
-    sh "python ${tmpdir}/merge-junit-results.py junit-*.xml >junit.xml"
+    sh "python3 ${tmpdir}/merge-junit-results.py junit-*.xml >junit.xml"
     sh 'rm junit-*.xml'
     junit 'junit.xml'
 }