diff --git a/Sources/Foundation/Data.swift b/Sources/Foundation/Data.swift
index 4aa28e2c87..3ce87d24a6 100644
--- a/Sources/Foundation/Data.swift
+++ b/Sources/Foundation/Data.swift
@@ -21,6 +21,10 @@ internal func malloc_good_size(_ size: Int) -> Int {
 
 @_implementationOnly import CoreFoundation
 
+#if canImport(Glibc)
+import Glibc
+#endif
+
 internal func __NSDataInvokeDeallocatorUnmap(_ mem: UnsafeMutableRawPointer, _ length: Int) {
 #if os(Windows)
     UnmapViewOfFile(mem)
diff --git a/Sources/Foundation/NSLock.swift b/Sources/Foundation/NSLock.swift
index 3bfc9e4aad..d6b5649a06 100644
--- a/Sources/Foundation/NSLock.swift
+++ b/Sources/Foundation/NSLock.swift
@@ -8,6 +8,11 @@
 //
 
 @_implementationOnly import CoreFoundation
+
+#if canImport(Glibc)
+import Glibc
+#endif
+
 #if os(Windows)
 import WinSDK
 #endif
diff --git a/Sources/Foundation/Thread.swift b/Sources/Foundation/Thread.swift
index 683a7358c9..163ca33880 100644
--- a/Sources/Foundation/Thread.swift
+++ b/Sources/Foundation/Thread.swift
@@ -9,6 +9,10 @@
 
 @_implementationOnly import CoreFoundation
 
+#if canImport(Glibc)
+import Glibc
+#endif
+
 // WORKAROUND_SR9811
 #if os(Windows)
 internal typealias _swift_CFThreadRef = HANDLE