diff --git a/Sources/ConnectionPoolModule/NIOLock.swift b/Sources/ConnectionPoolModule/NIOLock.swift
index b6cd7164..7a7f3e50 100644
--- a/Sources/ConnectionPoolModule/NIOLock.swift
+++ b/Sources/ConnectionPoolModule/NIOLock.swift
@@ -21,13 +21,13 @@ import Darwin
 import ucrt
 import WinSDK
 #elseif canImport(Glibc)
-import Glibc
+@preconcurrency import Glibc
 #elseif canImport(Musl)
-import Musl
+@preconcurrency import Musl
 #elseif canImport(Bionic)
-import Bionic
+@preconcurrency import Bionic
 #elseif canImport(WASILibc)
-import WASILibc
+@preconcurrency import WASILibc
 #if canImport(wasi_pthread)
 import wasi_pthread
 #endif
diff --git a/Sources/ConnectionPoolModule/PoolStateMachine.swift b/Sources/ConnectionPoolModule/PoolStateMachine.swift
index 044fa85f..b99bdfdf 100644
--- a/Sources/ConnectionPoolModule/PoolStateMachine.swift
+++ b/Sources/ConnectionPoolModule/PoolStateMachine.swift
@@ -1,9 +1,20 @@
 #if canImport(Darwin)
 import Darwin
+#elseif os(Windows)
+import ucrt
 #elseif canImport(Glibc)
-import Glibc
+@preconcurrency import Glibc
 #elseif canImport(Musl)
-import Musl
+@preconcurrency import Musl
+#elseif canImport(Bionic)
+@preconcurrency import Bionic
+#elseif canImport(WASILibc)
+@preconcurrency import WASILibc
+#if canImport(wasi_pthread)
+import wasi_pthread
+#endif
+#else
+#error("The PoolStateMachine module was unable to identify your C library.")
 #endif
 
 @usableFromInline