3 files changed, 5 insertions, 5 deletions
diff --git a/otherlibs/win32unix/nonblock.c b/otherlibs/win32unix/nonblock.c
index 8df1048d5..1f2550b05 100755
--- a/otherlibs/win32unix/nonblock.c
+++ b/otherlibs/win32unix/nonblock.c
@@ -26,7 +26,7 @@ CAMLprim value unix_set_nonblock(socket)
     win32_maperr(WSAGetLastError());
     uerror("unix_set_nonblock", Nothing);
   }
-  Flags_fd_val(socket) = Flags_fd_val(socket) | FLAGS_FD_IS_BLOCKING;
+  Flags_fd_val(socket) = Flags_fd_val(socket) & ~FLAGS_FD_IS_BLOCKING;
   return Val_unit;
 }
 
@@ -39,6 +39,6 @@ CAMLprim value unix_clear_nonblock(socket)
     win32_maperr(WSAGetLastError());
     uerror("unix_clear_nonblock", Nothing);
   }
-  Flags_fd_val(socket) = Flags_fd_val(socket) & ~FLAGS_FD_IS_BLOCKING;
+  Flags_fd_val(socket) = Flags_fd_val(socket) | FLAGS_FD_IS_BLOCKING;
   return Val_unit;
 }
diff --git a/otherlibs/win32unix/select.c b/otherlibs/win32unix/select.c
index d96c3d9d2..af9766ff8 100644
--- a/otherlibs/win32unix/select.c
+++ b/otherlibs/win32unix/select.c
@@ -556,7 +556,7 @@ void socket_poll (HANDLE hStop, void *_data)
       if (iterQuery->uFlagsFd & FLAGS_FD_IS_BLOCKING)
       {
         DEBUG_PRINT("Restore a blocking socket");
-        iMode = 1;
+        iMode = 0;
         check_error(lpSelectData,
           WSAEventSelect((SOCKET)(iterQuery->hFileDescr), aEvents[i], 0) != 0 ||
           ioctlsocket((SOCKET)(iterQuery->hFileDescr), FIONBIO, &iMode) != 0);
diff --git a/otherlibs/win32unix/unixsupport.c b/otherlibs/win32unix/unixsupport.c
index 2a45684a6..f6431955b 100644
--- a/otherlibs/win32unix/unixsupport.c
+++ b/otherlibs/win32unix/unixsupport.c
@@ -54,7 +54,7 @@ value win_alloc_handle(HANDLE h)
   Handle_val(res) = h;
   Descr_kind_val(res) = KIND_HANDLE;
   CRT_fd_val(res) = NO_CRT_FD;
-  Flags_fd_val(res) = 0;
+  Flags_fd_val(res) = FLAGS_FD_IS_BLOCKING;
   return res;
 }
 
@@ -64,7 +64,7 @@ value win_alloc_socket(SOCKET s)
   Socket_val(res) = s;
   Descr_kind_val(res) = KIND_SOCKET;
   CRT_fd_val(res) = NO_CRT_FD;
-  Flags_fd_val(res) = 0;
+  Flags_fd_val(res) = FLAGS_FD_IS_BLOCKING;
   return res;
 }