diff --git a/python/pyspark/worker.py b/python/pyspark/worker.py
index 9b54affb137f5..84e5cca5d3c00 100644
--- a/python/pyspark/worker.py
+++ b/python/pyspark/worker.py
@@ -468,7 +468,7 @@ def main(infile, outfile):
         version = utf8_deserializer.loads(infile)
         if version != "%d.%d" % sys.version_info[:2]:
             raise Exception(("Python in worker has different version %s than that in " +
-                             "driver %s, PySpark cannot run with different minor versions." +
+                             "driver %s, PySpark cannot run with different minor versions. " +
                              "Please check environment variables PYSPARK_PYTHON and " +
                              "PYSPARK_DRIVER_PYTHON are correctly set.") %
                             ("%d.%d" % sys.version_info[:2], version))