diff --git a/.jsonlintschema b/.jsonlintschema
index aa840e6fa..63cb3c34a 100644
--- a/.jsonlintschema
+++ b/.jsonlintschema
@@ -23,7 +23,7 @@
                     "source": {
                         "description": "The website from which the icon originated",
                         "type": "string",
-                        "pattern": "^https?://",
+                        "pattern": "^https?://[^\\s]+$",
                         "required": true
                     }
                 },