diff --git a/openmc/_utils.py b/openmc/_utils.py
index 97c253f39d..b3c6d065c7 100644
--- a/openmc/_utils.py
+++ b/openmc/_utils.py
@@ -60,9 +60,10 @@ def download(url, checksum=None, as_browser=False, **kwargs):
     if checksum is not None:
         downloadsum = hashlib.md5(open(basename, 'rb').read()).hexdigest()
         if downloadsum != checksum:
-            raise IOError("MD5 checksum for {} does not match. If this is your first "
-                          "time receiving this message, please re-run the script. "
-                          "Otherwise, please contact OpenMC developers by emailing "
+            raise IOError("MD5 checksum for {} does not match. If this is "
+                          "your first time receiving this message, please "
+                          "re-run the script. Otherwise, please contact "
+                          "OpenMC developers by emailing "
                           "openmc-users@googlegroups.com.".format(basename))
 
     return basename