diff --git a/requirements.txt b/requirements.txt
index 608e8677f..628f489f2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,6 +7,6 @@ scipy==1.5.2; platform_python_implementation != "PyPy"
 munkres==1.1.2; platform_python_implementation == "PyPy"
 zopfli==0.1.6
 fs==2.4.11
-skia-pathops==0.4.2
+skia-pathops==0.4.2; platform_python_implementation != "PyPy"
 # this is only required to run Tests/cu2qu/{ufo,cli}_test.py
 ufoLib2==0.6.2