diff --git a/projects/icu/project.yaml b/projects/icu/project.yaml
index f6b719da1..48379c54d 100644
--- a/projects/icu/project.yaml
+++ b/projects/icu/project.yaml
@@ -12,6 +12,7 @@ auto_ccs:
  - elango@unicode.org
 sanitizers:
  - address
+ - undefined 
 # Disabled MSAN because of https://github.com/google/oss-fuzz/issues/6294
 #  - memory