diff --git a/util/io_posix.cc b/util/io_posix.cc
index 8f3760b80..f46efc902 100644
--- a/util/io_posix.cc
+++ b/util/io_posix.cc
@@ -768,6 +768,7 @@ Status PosixWritableFile::Allocate(uint64_t offset, uint64_t len) {
 }
 #endif
 
+#ifdef OS_LINUX
 Status PosixWritableFile::RangeSync(uint64_t offset, uint64_t nbytes) {
   assert(offset <= std::numeric_limits<off_t>::max());
   assert(nbytes <= std::numeric_limits<off_t>::max());
@@ -782,6 +783,7 @@ Status PosixWritableFile::RangeSync(uint64_t offset, uint64_t nbytes) {
 size_t PosixWritableFile::GetUniqueId(char* id, size_t max_size) const {
   return PosixHelper::GetUniqueIdFromFile(fd_, id, max_size);
 }
+#endif
 
 /*
  * PosixRandomRWFile
diff --git a/util/io_posix.h b/util/io_posix.h
index f77808adc..40f558a19 100644
--- a/util/io_posix.h
+++ b/util/io_posix.h
@@ -114,8 +114,10 @@ class PosixWritableFile : public WritableFile {
 #ifdef ROCKSDB_FALLOCATE_PRESENT
   virtual Status Allocate(uint64_t offset, uint64_t len) override;
 #endif
+#ifdef OS_LINUX
   virtual Status RangeSync(uint64_t offset, uint64_t nbytes) override;
   virtual size_t GetUniqueId(char* id, size_t max_size) const override;
+#endif
 };
 
 // mmap() based random-access