diff --git a/lib/std/os/windows.zig b/lib/std/os/windows.zig
index 101a2a339f07752dd069a71388e161918ee4811e..601f3a79b971270dda69a4efc2b664236fc2e674 100644
--- a/lib/std/os/windows.zig
+++ b/lib/std/os/windows.zig
@@ -692,6 +692,16 @@ pub fn WSASocketW(
     return rc;
 }
 
+pub fn closesocket(s: ws2_32.SOCKET) !void {
+    switch (ws2_32.closesocket(s)) {
+        0 => {},
+        ws2_32.SOCKET_ERROR => switch (ws2_32.WSAGetLastError()) {
+            else => |err| return unexpectedWSAError(err),
+        },
+        else => unreachable,
+    }
+}
+
 pub fn WSAIoctl(
     s: ws2_32.SOCKET,
     dwIoControlCode: DWORD,
diff --git a/lib/std/os/windows/ws2_32.zig b/lib/std/os/windows/ws2_32.zig
index 0554f09705e611096cbb92c3cf2c81167546876c..faaaedd4431a67b4082386dc53dbe35083bef849 100644
--- a/lib/std/os/windows/ws2_32.zig
+++ b/lib/std/os/windows/ws2_32.zig
@@ -240,6 +240,7 @@ pub extern "ws2_32" stdcallcc fn WSASocketW(
     g: GROUP,
     dwFlags: DWORD,
 ) SOCKET;
+pub extern "ws2_32" stdcallcc fn closesocket(s: SOCKET) c_int;
 pub extern "ws2_32" stdcallcc fn WSAIoctl(
     s: SOCKET,
     dwIoControlCode: DWORD,