diff --git a/projects/facebook.com/watchman/package.yml b/projects/facebook.com/watchman/package.yml
index ed8c01ba..8e557715 100644
--- a/projects/facebook.com/watchman/package.yml
+++ b/projects/facebook.com/watchman/package.yml
@@ -16,6 +16,8 @@ dependencies:
   openssl.org: ^1.1
   pcre.org/v2: ^10
   python.org: ~3.11
+  linux:
+    llvm.org: ~17 # libunwind
 build:
   dependencies:
     cmake.org: '*'