diff --git a/libos/src/Mode.cpp b/libos/src/Mode.cpp
index 69e64a4b..431a6aea 100644
--- a/libos/src/Mode.cpp
+++ b/libos/src/Mode.cpp
@@ -27,8 +27,7 @@ namespace os
         out[6] = (mode & S_ISGID) ? ((mode & S_IXGRP) ? 's' : 'S') : ((mode & S_IXGRP) ? 'x' : '-');
         out[7] = (mode & S_IROTH) ? 'r' : '-';
         out[8] = (mode & S_IWOTH) ? 'w' : '-';
-        // FIXME: Support the sticky bit.
-        out[9] = (mode & S_IXOTH) ? 'x' : '-';
+        out[9] = (mode & S_ISVTX) ? ((mode & S_IXOTH) ? 't' : 'T') : ((mode & S_IXOTH) ? 'x' : '-');
         out[10] = '\0';
     }
 }