diff --git a/jenkins_jobs/modules/triggers.py b/jenkins_jobs/modules/triggers.py
index 4f42cc00a..f42d56407 100644
--- a/jenkins_jobs/modules/triggers.py
+++ b/jenkins_jobs/modules/triggers.py
@@ -632,7 +632,7 @@ def pollscm(parser, xml_parent, data):
         cron = data
         ipch = 'false'
 
-    if not cron:
+    if not cron and cron != '':
         raise InvalidAttributeError('cron', cron)
 
     scmtrig = XML.SubElement(xml_parent, 'hudson.triggers.SCMTrigger')
diff --git a/tests/triggers/fixtures/pollscm004.xml b/tests/triggers/fixtures/pollscm004.xml
new file mode 100644
index 000000000..239bed26e
--- /dev/null
+++ b/tests/triggers/fixtures/pollscm004.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<project>
+  <triggers class="vector">
+    <hudson.triggers.SCMTrigger>
+      <spec/>
+      <ignorePostCommitHooks>false</ignorePostCommitHooks>
+    </hudson.triggers.SCMTrigger>
+  </triggers>
+</project>
diff --git a/tests/triggers/fixtures/pollscm004.yaml b/tests/triggers/fixtures/pollscm004.yaml
new file mode 100644
index 000000000..3d0d9d5e3
--- /dev/null
+++ b/tests/triggers/fixtures/pollscm004.yaml
@@ -0,0 +1,3 @@
+triggers:
+  - pollscm:
+      cron: ""