diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index 601f3a79b971270dda69a4efc2b664236fc2e674..7dddd39c412b0fc583e2196e9405b6a2e7f13a2b 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -708,7 +708,7 @@ pub fn WSAIoctl(
     inBuffer: ?[]const u8,
     outBuffer: []u8,
     overlapped: ?*ws2_32.WSAOVERLAPPED,
-    completionRoutine: ?*ws2_32.WSAOVERLAPPED_COMPLETION_ROUTINE,
+    completionRoutine: ?ws2_32.WSAOVERLAPPED_COMPLETION_ROUTINE,
 ) !DWORD {
     var bytes: DWORD = undefined;
     switch (ws2_32.WSAIoctl(
diff --git a/lib/std/os/windows/ws2_32.zig b/lib/std/os/windows/ws2_32.zig
index faaaedd4431a67b4082386dc53dbe35083bef849..ecb68a259e21cb98aece83477c3c2a5bc2f3b297 100644
--- a/lib/std/os/windows/ws2_32.zig
+++ b/lib/std/os/windows/ws2_32.zig
@@ -250,5 +250,5 @@ pub extern "ws2_32" stdcallcc fn WSAIoctl(
     cbOutBuffer: DWORD,
     lpcbBytesReturned: LPDWORD,
     lpOverlapped: ?*WSAOVERLAPPED,
-    lpCompletionRoutine: ?*WSAOVERLAPPED_COMPLETION_ROUTINE,
+    lpCompletionRoutine: ?WSAOVERLAPPED_COMPLETION_ROUTINE,
 ) c_int;