diff --git a/codepost/models/abstract/api_resource.py b/codepost/models/abstract/api_resource.py
index 9a82ae4..4265e5d 100644
--- a/codepost/models/abstract/api_resource.py
+++ b/codepost/models/abstract/api_resource.py
@@ -288,6 +288,15 @@ def instance_endpoint_by_id(self, id=None):
             except IndexError: # means formatting didn't work
                 pass
 
+            # This is NOT the proper fix; I'm only making this change to get
+            # scripts working after the breaking change made to the API and to
+            # this code.  I have no idea if this is the only "weird" case or not
+            # but the API requires a trailing / when *updating* submissions.
+            # At least this change doesn't seem to affect the other REST actions
+            # (GET at least; didn't bother testing others)
+            if self.class_endpoint == "/submissions/":
+                return urljoin(self.class_endpoint, "{}/".format(_id))
+
             # CASE 2: The class end point has not formatting parameter
             return urljoin(self.class_endpoint, "{}".format(_id))