diff --git a/setup.py b/setup.py
index 98473f4b..897033b9 100755
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@
 reqs = [
     'hdmf==3.5.4',  # temporary
     'zarr>=2.11.0',
-    'numpy<1.22; python_version>"3.7"',
+    'numpy<1.22; python_version=="3.7"',
     'numcodecs>=0.9.1',
     'pynwb>=2.3.2',
     'setuptools',