diff --git a/lib/ansible/plugins/inventory/ini.py b/lib/ansible/plugins/inventory/ini.py
index 216bd81e8a8..2175f421bac 100644
--- a/lib/ansible/plugins/inventory/ini.py
+++ b/lib/ansible/plugins/inventory/ini.py
@@ -203,7 +203,7 @@ class InventoryModule(BaseFileInventoryPlugin):
 
                 continue
             elif line.startswith('[') and line.endswith(']'):
-                self._raise_error("Invalid section entry: '%s'. Please make sure that there are no spaces" % line +
+                self._raise_error("Invalid section entry: '%s'. Please make sure that there are no spaces" % line + " " +
                                   "in the section entry, and that there are no other invalid characters")
 
             # It's not a section, so the current state tells us what kind of