diff --git a/src/libstore/s3-binary-cache-store.cc b/src/libstore/s3-binary-cache-store.cc
index 3c5101f00..5361bd9da 100644
--- a/src/libstore/s3-binary-cache-store.cc
+++ b/src/libstore/s3-binary-cache-store.cc
@@ -1,6 +1,7 @@
 #include "config.h"
 
 #if ENABLE_S3
+#if __linux__
 
 #include "s3-binary-cache-store.hh"
 #include "nar-info.hh"
@@ -269,3 +270,4 @@ static RegisterStoreImplementation regStore([](
 }
 
 #endif
+#endif