diff --git a/CURRENT_VERSION.txt b/CURRENT_VERSION.txt
index 3e5b7a1..039c750 100644
--- a/CURRENT_VERSION.txt
+++ b/CURRENT_VERSION.txt
@@ -1,2 +1,2 @@
 # bump the below version on release
-0.7.5
+0.7.5.post2
diff --git a/instruct/typedef.py b/instruct/typedef.py
index 23134d6..1c3351a 100644
--- a/instruct/typedef.py
+++ b/instruct/typedef.py
@@ -448,7 +448,7 @@ def is_typing_definition(item):
         origin = get_origin(item)
         if origin is not None:
             return is_typing_definition(origin)
-    if LOWER_THAN_310:
+    if not LOWER_THAN_310:
         if isinstance(item, (types.UnionType,)):
             return True
     return False