diff --git a/xpcom/io/nsLocalFileUnix.cpp b/xpcom/io/nsLocalFileUnix.cpp
index ad7ff0810ba6..a38f7942ffd7 100644
--- a/xpcom/io/nsLocalFileUnix.cpp
+++ b/xpcom/io/nsLocalFileUnix.cpp
@@ -401,7 +401,8 @@ nsLocalFile::OpenNSPRFileDesc(int32_t flags, int32_t mode, PRFileDesc **_retval)
 
 #if defined(LINUX) && !defined(ANDROID)
     if (flags & OS_READAHEAD) {
-        readahead(PR_FileDesc2NativeHandle(*_retval), 0, 0);
+        posix_fadvise(PR_FileDesc2NativeHandle(*_retval), 0, 0,
+                      POSIX_FADV_SEQUENTIAL);
     }
 #endif
     return NS_OK;