diff --git a/Articles/Sources/Articles/DatabaseID.swift b/Articles/Sources/Articles/DatabaseID.swift
index 86b6dc5de..32918a7ee 100644
--- a/Articles/Sources/Articles/DatabaseID.swift
+++ b/Articles/Sources/Articles/DatabaseID.swift
@@ -14,13 +14,12 @@ import RSCore
 // * Collisions aren’t going to happen with feed data
 
 private var databaseIDCache = [String: String]()
-private var databaseIDCacheLock = os_unfair_lock_s()
-
+private var databaseIDCacheLock = NSLock()
 public func databaseIDWithString(_ s: String) -> String {
-	os_unfair_lock_lock(&databaseIDCacheLock)
-	defer {
-		os_unfair_lock_unlock(&databaseIDCacheLock)
-	}
+    databaseIdCacheLock.lock()
+    defer {
+        databaseIdCacheLock.unlock()
+    }
 	
 	if let identifier = databaseIDCache[s] {
 		return identifier