diff --git a/sources/openslide/setup.py b/sources/openslide/setup.py
index 356245562..2077a7dc5 100644
--- a/sources/openslide/setup.py
+++ b/sources/openslide/setup.py
@@ -55,8 +55,8 @@ def prerelease_local_scheme(version):
     install_requires=[
         f'large-image{limit_version}',
         'openslide-python>=1.4.1',
-        'openslide-bin; platform_system=="linux" and platform_machine=="x86_64"',
-        'openslide-bin; platform_system=="linux" and platform_machine=="aarch64"',
+        'openslide-bin; platform_system=="Linux" and platform_machine=="x86_64"',
+        'openslide-bin; platform_system=="Linux" and platform_machine=="aarch64"',
         'openslide-bin; platform_system=="Windows" and platform_machine=="AMD64"',
         'openslide-bin; platform_system=="Darwin" and platform_machine=="arm64"',
         'openslide-bin; platform_system=="Darwin" and platform_machine=="x86_64"',