diff --git a/setup.py b/setup.py
index dab03e5593659e2c7aa3410179eb1bd6b6b39a64..2d55122f8ec7f27ba9480f7943900f11a8c2fd5d 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@ requirements = [
           "numpy>=1.6.0",
           ]
 
-if version[0] == 3 and version[1] = 6:
+if version[0] == 3 and version[1] == 6:
     requirements.append("dataclasses")
 
 setup(name="pytools",