diff --git a/lib/windows/winlean.nim b/lib/windows/winlean.nim
index 9793429b2d..13a70d6efe 100644
--- a/lib/windows/winlean.nim
+++ b/lib/windows/winlean.nim
@@ -961,13 +961,13 @@ type
                             dwRemoteAddressLength: DWORD,
                             lpdwBytesReceived: ptr DWORD,
                             lpOverlapped: POVERLAPPED): bool {.
-                            stdcall,gcsafe.}
+                            stdcall, gcsafe, raises: [].}
 
   WSAPROC_CONNECTEX* = proc (s: SocketHandle, name: ptr SockAddr, namelen: cint,
                              lpSendBuffer: pointer, dwSendDataLength: DWORD,
                              lpdwBytesSent: ptr DWORD,
                              lpOverlapped: POVERLAPPED): bool {.
-                             stdcall,gcsafe.}
+                             stdcall, gcsafe, raises: [].}
 
   WSAPROC_GETACCEPTEXSOCKADDRS* = proc(lpOutputBuffer: pointer,
                                        dwReceiveDataLength: DWORD,
@@ -977,7 +977,7 @@ type
                                        LocalSockaddrLength: ptr cint,
                                        RemoteSockaddr: ptr PSockAddr,
                                        RemoteSockaddrLength: ptr cint) {.
-                                       stdcall,gcsafe.}
+                                       stdcall, gcsafe, raises: [].}
 
 const
   WT_EXECUTEDEFAULT* = 0x00000000'i32