diff --git a/lib/galaxy/exceptions/__init__.py b/lib/galaxy/exceptions/__init__.py
index d04d650120c..d5335c9034e 100644
--- a/lib/galaxy/exceptions/__init__.py
+++ b/lib/galaxy/exceptions/__init__.py
@@ -103,10 +103,9 @@ class ToolMissingException(MessageException):
     status_code = 400
     err_code = error_codes.USER_TOOL_MISSING_PROBLEM
 
-    @property
-    def tool_id(self):
-        if 'tool_id' in self.extra_error_info:
-            return self.extra_error_info['tool_id']
+    def __init__(self, err_msg=None, type="info", tool_id=None, **extra_error_info):
+        super(ToolMissingException, self).__init__(err_msg, type, **extra_error_info)
+        self.tool_id = tool_id
 
 
 class RequestParameterInvalidException(MessageException):