diff --git a/stdlib/private/SwiftReflectionTest/SwiftReflectionTest.swift b/stdlib/private/SwiftReflectionTest/SwiftReflectionTest.swift
index 7661ed6516a..f5daaa7304d 100644
--- a/stdlib/private/SwiftReflectionTest/SwiftReflectionTest.swift
+++ b/stdlib/private/SwiftReflectionTest/SwiftReflectionTest.swift
@@ -179,7 +179,7 @@ internal func readUInt() -> UInt {
 /// process.
 internal func sendReflectionInfos() {
   debugLog("BEGIN \(#function)"); defer { debugLog("END \(#function)") }
-  let infos = (0..<_dyld_image_count()).flatMap(getReflectionInfoForImage)
+  let infos = (0..<_dyld_image_count()).filterMap(getReflectionInfoForImage)
 
   var numInfos = infos.count
   debugLog("\(numInfos) reflection info bundles.")
diff --git a/stdlib/public/SDK/Foundation/JSONEncoder.swift b/stdlib/public/SDK/Foundation/JSONEncoder.swift
index 63ef116d05e..eb997eda62a 100644
--- a/stdlib/public/SDK/Foundation/JSONEncoder.swift
+++ b/stdlib/public/SDK/Foundation/JSONEncoder.swift
@@ -1212,7 +1212,7 @@ fileprivate struct _JSONKeyedDecodingContainer<K : CodingKey> : KeyedDecodingCon
     // MARK: - KeyedDecodingContainerProtocol Methods
 
     public var allKeys: [Key] {
-        return self.container.keys.flatMap { Key(stringValue: $0) }
+        return self.container.keys.filterMap { Key(stringValue: $0) }
     }
 
     public func contains(_ key: Key) -> Bool {
diff --git a/stdlib/public/SDK/Foundation/PlistEncoder.swift b/stdlib/public/SDK/Foundation/PlistEncoder.swift
index 9544870d1f9..b8a852a7ccf 100644
--- a/stdlib/public/SDK/Foundation/PlistEncoder.swift
+++ b/stdlib/public/SDK/Foundation/PlistEncoder.swift
@@ -779,7 +779,7 @@ fileprivate struct _PlistKeyedDecodingContainer<K : CodingKey> : KeyedDecodingCo
     // MARK: - KeyedDecodingContainerProtocol Methods
 
     public var allKeys: [Key] {
-        return self.container.keys.flatMap { Key(stringValue: $0) }
+        return self.container.keys.filterMap { Key(stringValue: $0) }
     }
 
     public func contains(_ key: Key) -> Bool {