diff --git a/setup.py b/setup.py
index af830b2b0..e492b415f 100755
--- a/setup.py
+++ b/setup.py
@@ -1105,11 +1105,12 @@ def sdist():
 
 # A normal PyMuPDF package.
 
-requires_dist = list()
-if os.environ.get('PYODIDE_ROOT'):
-    # We can't pip install pytest on pyodide, so specify it here.
-    requires_dist.append('pytest')
-    requires_dist.append('pipcl')
+# We can't pip install pytest on pyodide, so specify it here.
+requires_dist = [
+    "pytest ; sys_platform == 'emscripten'",
+    "pipcl ; sys_platform == 'emscripten'",
+]
+
 
 p = pipcl.Package(
         'pymupdf',