diff --git a/librocksdb-sys/build.rs b/librocksdb-sys/build.rs
index 3592b92..ea7a2d1 100644
--- a/librocksdb-sys/build.rs
+++ b/librocksdb-sys/build.rs
@@ -90,7 +90,8 @@ fn build_rocksdb() {
         config.define("USE_RTTI", Some("1"));
     }
 
-    if cfg!(feature = "malloc-usable-size") {
+    #[cfg(feature = "malloc-usable-size")]
+    if target.contains("linux") {
         config.define("ROCKSDB_MALLOC_USABLE_SIZE", Some("1"));
     }