diff --git a/GRDB/Core/Support/Foundation/NSNumber.swift b/GRDB/Core/Support/Foundation/NSNumber.swift
index 9867e8f43f..1c5778c19e 100644
--- a/GRDB/Core/Support/Foundation/NSNumber.swift
+++ b/GRDB/Core/Support/Foundation/NSNumber.swift
@@ -1,4 +1,4 @@
-#if !os(Linux)
+#if !os(Linux) && !os(Windows)
 import Foundation
 
 private let integerRoundingBehavior = NSDecimalNumberHandler(
diff --git a/GRDB/Core/Support/Foundation/URL.swift b/GRDB/Core/Support/Foundation/URL.swift
index cf4b96d120..6db66ec3b8 100644
--- a/GRDB/Core/Support/Foundation/URL.swift
+++ b/GRDB/Core/Support/Foundation/URL.swift
@@ -1,6 +1,6 @@
 import Foundation
 
-#if !os(Linux)
+#if !os(Linux) && !os(Windows)
 /// NSURL stores its absoluteString in the database.
 extension NSURL: DatabaseValueConvertible {
     
diff --git a/GRDB/Core/Support/Foundation/UUID.swift b/GRDB/Core/Support/Foundation/UUID.swift
index 1ebca9d847..7595b53ef6 100644
--- a/GRDB/Core/Support/Foundation/UUID.swift
+++ b/GRDB/Core/Support/Foundation/UUID.swift
@@ -9,7 +9,7 @@ import SQLite3
 
 import Foundation
 
-#if !os(Linux)
+#if !os(Linux) && !os(Windows)
 /// NSUUID adopts DatabaseValueConvertible
 extension NSUUID: DatabaseValueConvertible {
     /// Returns a BLOB database value containing the uuid bytes.