diff --git a/server/fd.c b/server/fd.c
index 7c4ccb3a12..c41c4edb4d 100644
--- a/server/fd.c
+++ b/server/fd.c
@@ -501,7 +501,9 @@ static int set_unix_lock( struct fd *fd, file_pos_t start, file_pos_t end, int t
             if (fl.l_type == F_WRLCK) return 1;
             set_error( STATUS_ACCESS_DENIED );
             return 0;
+#ifdef EOVERFLOW
         case EOVERFLOW:
+#endif
         case EINVAL:
             /* this can happen if off_t is 64-bit but the kernel only supports 32-bit */
             /* in that case we shrink the limit and retry */
diff --git a/server/file.c b/server/file.c
index ebb600564e..4dfff91b02 100644
--- a/server/file.c
+++ b/server/file.c
@@ -462,7 +462,9 @@ void file_set_error(void)
     case ESPIPE:    set_win32_error( ERROR_SEEK ); break;
     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
+#ifdef EOVERFLOW
     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
+#endif
     default:        perror("file_set_error"); set_win32_error( ERROR_UNKNOWN ); break;
     }
 }