diff --git a/mps/tool/testcases.txt b/mps/tool/testcases.txt
index 6a8e0350858..bf5c4e258c9 100644
--- a/mps/tool/testcases.txt
+++ b/mps/tool/testcases.txt
@@ -16,7 +16,7 @@ awlutth        =T
 btcv
 bttest         =N                interactive
 djbench        =N                benchmark
-extcon
+extcon         =W                TODO: Enable when we can update Xcode project. See GitHub issue #217 <https://github.com/Ravenbrook/mps/issues/217>.
 finalcv        =P
 finaltest      =P
 forktest       =X