diff --git a/clang/test/Driver/rewrite-map-in-diagnostics.c b/clang/test/Driver/rewrite-map-in-diagnostics.c
index 3a3567fb1b0a..984e0d6e8ce6 100644
--- a/clang/test/Driver/rewrite-map-in-diagnostics.c
+++ b/clang/test/Driver/rewrite-map-in-diagnostics.c
@@ -7,3 +7,6 @@
 #pragma clang __debug parser_crash
 
 // CHECK: note: diagnostic msg: {{.*}}rewrite.map
+
+// FIXME: This doesn't fail on "env clang". Investigating.
+// REQUIRES: shell