diff --git a/da/compiler/parser.py b/da/compiler/parser.py
index cfaa777..a496913 100755
--- a/da/compiler/parser.py
+++ b/da/compiler/parser.py
@@ -690,7 +690,7 @@ def parse_module_header(self, node):
 
         if not (len(node.body) > 0 and
                 isinstance(node.body[0], Expr) and
-                isinstance(node.body[0].value, Str)):
+                isinstance(node.body[0].value, str)):
             return
 
         self.debug("parsing module header...")