diff --git a/elixir/web.py b/elixir/web.py
index e50fe8f..c7bb6b9 100755
--- a/elixir/web.py
+++ b/elixir/web.py
@@ -230,7 +230,7 @@ class SourceResource:
             return
 
         # Check if path contains only allowed characters
-        if not search('^[A-Za-z0-9_/.,+-]*$', path):
+        if not search('^[A-Za-z0-9_/.,+-=]*$', path):
             raise ElixirProjectError('Error', 'Path contains characters that are not allowed',
                               project=project, version=version, query=query)